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LangGraph 101

A practical guide series for learning LangGraph - the framework that turns brittle, one-shot AI agents into ones that loop, branch, remember, and know when to ask a human. Written by people who build agents for a living.

Foundations → Practitioner · ~28 minutes total
needs tool result done START Agent node Tool node END

A LangGraph agent: nodes do the work, edges decide what happens next - including looping back.

FOUNDATIONS

Start Here

Never touched LangGraph, or only skimmed the docs once? These two guides get you oriented.

What Is LangGraph? (And Why Not Just LangChain)

The plain-English version: what problem it actually solves, and when you need it versus when you don't.

Foundations 5 min read

The Building Blocks: State, Nodes, Edges & Graphs

Four ideas that cover almost everything - once these click, the rest of LangGraph is just combinations of them.

Foundations 6 min read
HANDS-ON

Build Something

Time to go from reading about graphs to actually running one.

Build Your First LangGraph Agent

A hands-on walkthrough - define the state, wire up the nodes, add a conditional edge, and run it.

Hands-On 7 min read

Want more hands-on AI builds like this?

APA Mastery runs live, practical sessions on working with modern AI tools - not just theory.

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ADVANCED

Make It Production-Ready

The two things that separate a demo from something you'd actually trust in production.

Memory & Persistence: Making Agents Reliable

Checkpointers, threads, and why your agent should be able to survive a crash without losing its place.

Advanced 6 min read

Human-in-the-Loop & Multi-Agent Patterns

How to make a graph pause for approval, and how to split one big agent into several smaller, focused ones.

Advanced 7 min read