AI learning guide

Best AI resources for AI search and deep research

Learn grounded search, citations, web research agents, and deep-research workflows.

Best Perplexity primary source: Perplexity Agent API models. Official Perplexity model table for grounded search and agent workflows. Start here when you need the current Perplexity search and research stack rather than a marketing summary.

Best Google deep-research source: Gemini Deep Research Agent. Official Google AI for Developers guide to long-running research agents. Use it to understand cited reports, background execution, and research-agent behavior.

Best retrieval foundation: OpenAI Retrieval guide. Official OpenAI guide to retrieval and grounded answers. Use it to understand grounding patterns that apply beyond one search provider.

Deep research depends on source discipline

AI search is useful only when it makes sources inspectable. A good research workflow separates the question, source discovery, extracted claims, synthesis, citations, and uncertainty.

Perplexity, Gemini, and OpenAI docs are the right starting points because search and research products change quickly. Check current Agent API model tables, deep-research docs, and retrieval guidance before trusting a course or newsletter summary.

Test with questions you can verify

Before trusting a deep research workflow, run it on topics where you know the answer or can check the sources. Look for unsupported claims, stale evidence, citation mismatch, and missing counterarguments.

A useful resource should teach verification habits, not just polished reports. The report is the output; the source trail is the product.

Recommended courses and resources

  1. Perplexity Deep Research and Search API docs

    API docs · Perplexity · Intermediate

    You want to compare search, Sonar, Agent API, and cited research workflows from the primary source.

  2. OpenAI deep research guide

    Guide · OpenAI · Intermediate to advanced

    You want the official OpenAI path for long-running research tasks that combine reasoning, web search, remote MCP servers, and detailed cited reports.

  3. OpenAI web search guide

    Guide · OpenAI · Intermediate

    You want the official OpenAI path for live web retrieval, citations, and freshness-aware research behavior inside agent workflows.

  4. Meet the Claude models

    Model guide · Anthropic · Intermediate

    You want Anthropic's current learner-facing overview of the Claude lineup before changing long-running agent, coding, or enterprise research workflows.

  5. Gemini Agents Overview

    Guide · Google AI for Developers · Intermediate

    You want the official overview of Gemini managed agents, sandbox behavior, and when to use agent workflows instead of plain model calls.

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About this guide

Author: Learnetto Editorial Team. Learnetto maintains this AI learning directory by organizing public course pages, official documentation, educator material, and practical learning resources.

How it is made: Learnetto uses public course pages, official documentation, educator material, and directory data to compile these recommendations. AI may help draft and organize the page, but recommendations are checked against the listed sources, page topic, and learner intent.

Review policy: We only add a named personal reviewer when that person has substantially reviewed the page. Until then, the page is attributed to Learnetto rather than a founder, editor, or individual expert.

Last updated: July 19, 2026. Suggest a correction if a course, doc, or recommendation is outdated.

Educators and sources

Educator / source Best for Skills Start with
Kevin Indig profile photo
Growth leaders, SEO teams, founders AI search, SEO strategy, Growth, Content systems Read one AI search essay and update a search or content strategy hypothesis.
Rand Fishkin profile photo
Marketers, founders, audience researchers AI search, Audience research, Marketing strategy, Content quality Use AI as an analysis assistant after gathering audience data, not as a substitute for research.

Resources

OpenAI deep research guide

Guide · OpenAI · Intermediate to advanced

You want the official OpenAI path for long-running research tasks that combine reasoning, web search, remote MCP servers, and detailed cited reports.

OpenAI web search guide

Guide · OpenAI · Intermediate

You want the official OpenAI path for live web retrieval, citations, and freshness-aware research behavior inside agent workflows.

Meet the Claude models

Model guide · Anthropic · Intermediate

You want Anthropic's current learner-facing overview of the Claude lineup before changing long-running agent, coding, or enterprise research workflows.

Gemini Agents Overview

Guide · Google AI for Developers · Intermediate

You want the official overview of Gemini managed agents, sandbox behavior, and when to use agent workflows instead of plain model calls.

Perplexity API overview

API docs · Perplexity · Beginner to advanced

You need to understand Search, Agent, and Embeddings APIs for grounded AI research workflows and multi-provider model access.

Perplexity Sonar models

Model docs · Perplexity · Intermediate

You need to compare Sonar, Sonar Pro, Sonar Reasoning Pro, and Sonar Deep Research for grounded search workflows.

Perplexity Sonar Deep Research

Model docs · Perplexity · Intermediate

You want the specific Sonar Deep Research tradeoffs, pricing, and workflow fit before using it for exhaustive cited research tasks.

Gemini Deep Research Agent

Guide · Google AI for Developers · Intermediate to advanced

You want the latest official Google docs for long-running research agents, cited reports, background execution, and MCP-aware investigation workflows.

Gemini URL Context

Guide · Google AI for Developers · Intermediate

You want Gemini to read and reason over live web pages directly, which is useful for cited research, page summarization, and web-grounded automation.

Gemini Google Search grounding

Guide · Google AI for Developers · Intermediate

You need the official Google path for grounding Gemini with Google Search instead of relying on stale prompts or manual search glue.

Perplexity Agent API models

Model docs · Perplexity · Intermediate

You need Perplexity's current multi-provider model table for grounded agent workflows and fallback behavior.

Perplexity Search API

API docs · Perplexity · Intermediate

You need ranked web results and domain filtering rather than only generated summaries.

Perplexity MCP server overview

Guide · Perplexity · Intermediate

You want Perplexity's official MCP path for bringing grounded search into agent workflows and tool-connected research setups.

LangChain Open Deep Research

GitHub repo · LangChain · Intermediate to advanced

You want a configurable open-source deep-research agent that works across search tools, MCP servers, and multiple model providers.

Growth Memo

Newsletter · Kevin Indig · Beginner to intermediate

Use this when you want Kevin Indig's material for ai search and related AI skills.