# [Rebilder guides](https://rebilder.com/learn)

| Title | Note | Updated |
| --- | --- | --- |
| [AI search optimization: the definitive guide](https://rebilder.com/learn/ai-search-optimization) | AI search optimization end to end: how assistants actually retrieve pages, the four levers you control, measured before/after numbers, and how to track it. | 2026-08-16 |
| [Answer engine optimization: how to be the source of the answer](https://rebilder.com/learn/answer-engine-optimization) | What answer engine optimization is, how answer engines actually fetch and read a page, the method in order, and what you can honestly measure. | 2026-08-16 |
| [GEO vs SEO: what actually changes, and what does not](https://rebilder.com/learn/geo-vs-seo) | GEO vs SEO without the rebrand: what genuinely differs, what carries over unchanged, where AEO fits, and which KPIs belong to each. | 2026-08-20 |
| [AI visibility tools: how to choose one that measures something](https://rebilder.com/learn/ai-visibility-tools) | A criteria-led guide to AI visibility tools: the three layers a stack covers, the questions that separate a measurement from a sample, and what is free. | 2026-08-20 |
| [LLM SEO: what transfers from SEO, and what does not](https://rebilder.com/learn/llm-seo) | LLM SEO for people who already do SEO: what carries over, what to stop doing, a step-by-step audit, and what you can honestly promise a client. | 2026-08-20 |
| [llms.txt: what it is, how to write one, and whether it works](https://rebilder.com/learn/llms-txt) | What llms.txt is, the exact file shape with a working example, where to put it, and the evidence on whether it actually improves AI citations. No hype. | 2026-08-16 |
| [What is agentic commerce?](https://rebilder.com/learn/what-is-agentic-commerce) | Agentic commerce, defined: the two species of buyer, the ACP/UCP/MCP timeline, real before/after token numbers, and how to get your store ready for free. | 2026-08-05 |
| [AI shopping agents: what they are and how they read your store](https://rebilder.com/learn/ai-shopping-agents) | What AI shopping agents are, how ChatGPT, Claude, and Perplexity fetch and compare product pages, and how to see agent traffic on your own store. | 2026-08-05 |
| [How to get recommended by ChatGPT: a merchant’s guide](https://rebilder.com/learn/get-recommended-by-chatgpt) | How ChatGPT finds and cites products (retrieval, extraction, citation) and the concrete steps merchants can take this week. Real numbers, no snake oil. | 2026-08-20 |
| [Answer engine optimization tools: a 2026 buyer’s guide](https://rebilder.com/learn/answer-engine-optimization-tools) | A 2026 buyer’s guide to answer engine optimization tools by category: visibility trackers, content optimizers, and serving-layer infrastructure. | 2026-08-05 |
| [AI agent user agents: a field guide to every string in your logs](https://rebilder.com/learn/ai-agent-user-agents) | Real AI agent user agent strings (ChatGPT-User, GPTBot, claude-code, PerplexityBot), the exact headers each one sends, and how to detect them properly. | 2026-08-20 |
| [Shopify agentic commerce: an honest readiness guide](https://rebilder.com/learn/shopify-agentic-commerce) | What AI agents get from a Shopify PDP today (91KB of theme HTML), how UCP fits, and how an app proxy serves clean markdown under your shop domain. | 2026-08-05 |
| [The agentic commerce protocol landscape: ACP, UCP, and MCP](https://rebilder.com/learn/agentic-commerce-protocol) | ACP, UCP, and MCP explained: what each agentic commerce protocol covers, who backs it, why specs churn quarterly, and how merchants can prepare. | 2026-08-05 |