The whole catalog, ecosystem by ecosystem
Complete, self-paced guides ordered into ecosystems that run from fundamentals to production. Each ecosystem is built from what real job postings actually ask for.
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Python Ecosystem
In order, from fundamentals to production. Start at 1.
12 courses
Python Oop And Data Modeling
A plain dictionary with the right keys can look like an object, but it doesn't protect its invariants, doesn't expose…
Beginner64 lessonsModern Python Tooling Guide
A Python project's toolchain — which interpreter runs it, where dependencies live, who checks style and types, who…
Beginner48 lessonsPython Typing And Pydantic
A type annotation in Python is a label, not a lock.
Beginner64 lessonsBuilding with LLMs in Code
Integrate an LLM into a real product from code, not from an experimentation notebook.
Advanced64 lessonsDebugging and Troubleshooting
Take an unknown failure — a thirty-line traceback, a silently wrong result, a regression buried under two hundred…
Advanced48 lessonsWorking with Coding Agents
Learn to direct coding agents as a professional craft, not improvisation.
Advanced48 lessonsPostgreSQL & SQLAlchemy Guide
Learn PostgreSQL from installation to optimized queries, model your data with the SQLAlchemy ORM, manage your schema…
Intermediate48 lessonsGit & GitHub Guide
Master version control with Git and collaborative development with GitHub, from your first commit to production CI/CD…
Intermediate105 lessonsSecurity for AI-Generated Code
In Veracode's benchmark (July 2025.
Advanced38 lessonsPython Async And Concurrency
Concurrency doesn't make work faster.
Advanced64 lessonsPython Packaging And Cli Tools
A script that "works on my machine" and an installable package someone else can actually use are two very different…
Advanced64 lessonsPython Performance and Profiling
Intuition about what makes a program slow is almost always wrong, and optimizing without measuring is the most common…
Advanced64 lessons