Engineering knowledge that goes beyond the surface #
Free courses and tutorials built by engineers with years of production experience. Whether you’re just starting out or have years under your belt, you’ll find content with the depth and honesty that most tutorials skip.
Start learning #
Git — version control from first principles #
Understand not just how to use Git, but why it works the way it does. From your first commit to Git’s internal data model — the part most tutorials never reach.
| Level | Beginner → Intermediate |
| Pages | 6 |
| Topics | Version control, commits, branching, history |
Databases — from flat files to production schemas #
From flat files to relational databases to distributed systems. Understand why databases exist, how the relational model works, when to reach for NoSQL, and how to design schemas that hold up in production.
| Level | Beginner → Intermediate |
| Pages | 8 |
| Topics | Relational model, SQL, normalization, indexes, NoSQL |
Docker and containers — coming soon #
From “works on my machine” to containers that run anywhere. How Docker really works under the hood — images, layers, the engine internals — not just the commands.
System design — coming soon #
How real systems are architected. Load balancing, caching, databases at scale, message queues, and trade-offs that matter when millions of requests are hitting your service.
Built by engineers, for engineers #
This site is written by software engineers with years of experience building and operating systems at scale — not by content farms optimizing for page views.
Content here spans the full range — from first principles for someone just starting out, to the production-grade depth that experienced engineers actually want. No topic is too basic to explain well, and no topic is too advanced to cover.
Every page aims to answer three questions:
- What is this? — a clear definition, not a dictionary quote
- Why does it exist? — the problem it solves
- How does it work? — with real examples, not toy demos
If something is unclear, that’s a bug. Tell us →
Stay in the loop #
New courses and tutorials drop regularly. No spam — just a short note when something worth reading is ready.
All content is free. No account required. No paywalls.