# girith.com > A knowledge center for everyday people who want to understand AI and discover AI solutions in every domain. Plain guides, curated tools, no jargon. Every page below is also available as raw markdown at /md//, e.g. https://girith.com/md/learn/what-is-rag. ## Learn - [How Much Does AI Cost?](https://girith.com/learn/how-much-does-ai-cost): What AI actually costs in 2025 — what the free tiers really give you, when subscriptions pay off, API pricing in plain terms, and the free-trap to avoid. [markdown](https://girith.com/md/learn/how-much-does-ai-cost) - [Is AI Safe to Use?](https://girith.com/learn/is-ai-safe-to-use): A practical safety guide to using AI — real risks (privacy, accuracy, scams) versus movie risks, and the six habits that keep you safe. [markdown](https://girith.com/md/learn/is-ai-safe-to-use) - [What is Machine Learning?](https://girith.com/learn/what-is-machine-learning): Machine learning explained without the math — how computers learn patterns from examples instead of rules, and why it powers spam filters and ChatGPT. [markdown](https://girith.com/md/learn/what-is-machine-learning) - [How to Spot AI Hallucinations](https://girith.com/learn/how-to-spot-ai-hallucinations): A practical checklist for spotting AI mistakes — the five tell-tale patterns of hallucinations and the two-minute verification habit that catches them. [markdown](https://girith.com/md/learn/how-to-spot-ai-hallucinations) - [What is Generative AI?](https://girith.com/learn/what-is-generative-ai): Generative AI explained for everyday people — what it is, how it differs from the AI in your email spam filter, and where you already use it. [markdown](https://girith.com/md/learn/what-is-generative-ai) - [Are AI Content Detectors Reliable?](https://girith.com/learn/are-ai-content-detectors-reliable): Short answer — no, not reliably. How AI detectors work, why they fail, who gets hurt by false positives, and what to do instead of trusting them. [markdown](https://girith.com/md/learn/are-ai-content-detectors-reliable) - [Which AI Chatbot Should I Use?](https://girith.com/learn/which-ai-chatbot-should-i-use): ChatGPT vs Claude vs Gemini vs Perplexity compared for everyday use — strengths, weaknesses and a simple rule for picking (and not paying too early). [markdown](https://girith.com/md/learn/which-ai-chatbot-should-i-use) - [How to Write Good AI Prompts](https://girith.com/learn/how-to-write-good-ai-prompts): Practical prompt-writing for everyday people — a repeatable recipe for getting useful answers from ChatGPT, Claude or Gemini, with examples. [markdown](https://girith.com/md/learn/how-to-write-good-ai-prompts) - [What is a Large Language Model (LLM)?](https://girith.com/learn/what-is-a-large-language-model): A plain-language explanation of large language models — how ChatGPT-style AI actually works, what it is good and bad at, in everyday words. [markdown](https://girith.com/md/learn/what-is-a-large-language-model) - [What is RAG (Retrieval-Augmented Generation)?](https://girith.com/learn/what-is-rag): RAG explained simply — how AI chatbots look up facts in documents before answering, why it reduces made-up answers, and when it is used. [markdown](https://girith.com/md/learn/what-is-rag) ## AI by domain - [AI in Creative Work](https://girith.com/domains/ai-in-creative-work): How AI is changing design, music, video and writing — what creative professionals actually use it for, and where the human edge still lives. [markdown](https://girith.com/md/domains/ai-in-creative-work) - [AI in Cybersecurity](https://girith.com/domains/ai-in-cybersecurity): How AI fights phishing, malware and fraud — and how attackers use the same tools. The AI security arms race, explained for everyday people. [markdown](https://girith.com/md/domains/ai-in-cybersecurity) - [AI in Education](https://girith.com/domains/ai-in-education): How AI tutors, grading assistants and study tools are changing learning for students and teachers — the real benefits and real risks. [markdown](https://girith.com/md/domains/ai-in-education) - [AI in Finance](https://girith.com/domains/ai-in-finance): How AI is used in banking, investing and fraud detection — what it means for your money, explained without the jargon. [markdown](https://girith.com/md/domains/ai-in-finance) - [AI in Healthcare](https://girith.com/domains/ai-in-healthcare): How artificial intelligence is changing medicine — diagnosis, drug discovery, admin work and patient care, explained for everyday people. [markdown](https://girith.com/md/domains/ai-in-healthcare) - [AI in Hiring and HR](https://girith.com/domains/ai-in-hiring-and-hr): How AI screens resumes, schedules interviews and answers HR questions — plus the bias risks and disclosure rules every job seeker should know. [markdown](https://girith.com/md/domains/ai-in-hiring-and-hr) - [AI in Legal Work](https://girith.com/domains/ai-in-legal): How AI is changing legal work — document review, research and drafting — plus the famous court cases where lawyers trusted AI too much. [markdown](https://girith.com/md/domains/ai-in-legal) - [AI in Marketing](https://girith.com/domains/ai-in-marketing): How AI is used in marketing — content drafts, ad targeting, SEO and analytics — with an honest look at what it does and does not replace. [markdown](https://girith.com/md/domains/ai-in-marketing) - [AI in Retail and E-commerce](https://girith.com/domains/ai-in-retail): How AI runs modern retail — product recommendations, demand forecasting, chatbots and generative product pages — explained for merchants and shoppers. [markdown](https://girith.com/md/domains/ai-in-retail) - [AI in Travel and Hospitality](https://girith.com/domains/ai-in-travel): How AI plans your trips and runs hotels — dynamic pricing, itinerary planners, chat concierges and the downsides to watch for. [markdown](https://girith.com/md/domains/ai-in-travel) ## AI tools - [Adobe Firefly](https://girith.com/tools/adobe-firefly): Adobe Firefly is the commercially-safe AI image generator — trained on licensed content with IP indemnification for businesses. What it does and costs. [markdown](https://girith.com/md/tools/adobe-firefly) - [ChatGPT](https://girith.com/tools/chatgpt): What ChatGPT is, what the free vs paid plans actually get you, and the everyday tasks it is genuinely good at — an honest plain-language review. [markdown](https://girith.com/md/tools/chatgpt) - [Claude](https://girith.com/tools/claude-ai): Claude is Anthropic's AI assistant — known for careful writing, long-document analysis and safety. What it does, limits and pricing in plain words. [markdown](https://girith.com/md/tools/claude-ai) - [ElevenLabs](https://girith.com/tools/elevenlabs): ElevenLabs is the leading AI voice platform — text-to-speech, voice cloning and dubbing. What it does, pricing and the ethics lines to respect. [markdown](https://girith.com/md/tools/elevenlabs) - [Gemini](https://girith.com/tools/gemini): Gemini is Google's AI assistant — built into Gmail, Docs and Android. What it is good at, what it costs, and when it beats ChatGPT or Claude. [markdown](https://girith.com/md/tools/gemini) - [GitHub Copilot](https://girith.com/tools/github-copilot): GitHub Copilot is the AI pair-programmer inside your editor — what it does well, what it costs, and how it changes learning to code. [markdown](https://girith.com/md/tools/github-copilot) - [Grammarly](https://girith.com/tools/grammarly): Grammarly evolved from spell-checker to AI writing assistant — what it does now, what it costs, and where its suggestions still need a human. [markdown](https://girith.com/md/tools/grammarly) - [Midjourney](https://girith.com/tools/midjourney): Midjourney is the AI image generator known for stunning, artistic results — what it does, how much it costs, and when it beats the alternatives. [markdown](https://girith.com/md/tools/midjourney) - [Notion AI](https://girith.com/tools/notion-ai): Notion AI adds writing, summarizing and Q&A across your workspace notes — what it does, pricing, and whether it beats a separate chatbot. [markdown](https://girith.com/md/tools/notion-ai) - [Perplexity](https://girith.com/tools/perplexity): Perplexity is an AI answer engine that searches the web and answers with cited sources — what it is for, and when to pick it over ChatGPT or Google. [markdown](https://girith.com/md/tools/perplexity) ## Glossary - [AI Agent](https://girith.com/glossary/agent): An AI agent is an LLM that plans and takes multi-step actions with tools — booking, browsing, coding — not just chatting. Plain-language definition. [markdown](https://girith.com/md/glossary/agent) - [Computer Vision](https://girith.com/glossary/computer-vision): Computer vision is AI that understands images and video — how it spots tumors, reads X-rays and powers your phone's camera. Plain-language definition. [markdown](https://girith.com/md/glossary/computer-vision) - [Context Window](https://girith.com/glossary/context-window): A context window is how much text an AI can consider at once — its short-term memory. What it means, why it matters and how big they have gotten. [markdown](https://girith.com/md/glossary/context-window) - [Embeddings](https://girith.com/glossary/embeddings): Embeddings turn words and documents into lists of numbers so machines can compare meaning. Plain-language definition and why search uses them. [markdown](https://girith.com/md/glossary/embeddings) - [Explainability](https://girith.com/glossary/explainability): Explainability means an AI's decision can be explained in terms a human can check. Why regulators demand it and what "explainable AI" really means. [markdown](https://girith.com/md/glossary/explainability) - [Fine-tuning](https://girith.com/glossary/fine-tuning): Fine-tuning retrains an AI model on your examples to specialize its behavior. When it is worth it, and when RAG is the better fix. [markdown](https://girith.com/md/glossary/fine-tuning) - [Hallucination](https://girith.com/glossary/hallucination): An AI hallucination is a confident but wrong answer from an AI model. Why it happens and how to catch it, in plain language. [markdown](https://girith.com/md/glossary/hallucination) - [LLM](https://girith.com/glossary/llm): LLM stands for large language model — the AI behind ChatGPT and Claude. One-line definition plus how it works, in plain language. [markdown](https://girith.com/md/glossary/llm) - [Multimodal](https://girith.com/glossary/multimodal): Multimodal AI works across text, images, audio and video in one model. What that unlocks and why it became the default. [markdown](https://girith.com/md/glossary/multimodal) - [Parameters](https://girith.com/glossary/parameters-ai): Parameters are the internal values a model learns during training — the numbers behind billion-parameter models. What they are and why size is not everything. [markdown](https://girith.com/md/glossary/parameters-ai) - [Prompt Engineering](https://girith.com/glossary/prompt-engineering): Prompt engineering is the skill of writing instructions that get AI to produce what you actually want. The craft, minus the hype. [markdown](https://girith.com/md/glossary/prompt-engineering) - [RAG](https://girith.com/glossary/rag): RAG (Retrieval-Augmented Generation) means an AI looks up facts before answering. Short definition, why it matters, and where you meet it. [markdown](https://girith.com/md/glossary/rag) - [Token](https://girith.com/glossary/token): AI models read text as tokens — chunks of a few characters. Why tokens matter for pricing, limits and why models miscount letters. [markdown](https://girith.com/md/glossary/token) - [Vector Database](https://girith.com/glossary/vector-database): A vector database stores embeddings and finds similar meanings fast — the search engine behind RAG and semantic search, explained simply. [markdown](https://girith.com/md/glossary/vector-database)