2,199 links, picked by hand. Each one says where it parts ways with its neighbours.

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1. A Tour of Go

   Go’s official tour, with every example runnable and editable in the browser.

2. cppreference

   The most widely used reference for the C and C++ standard library, marking which standard (C++11/17/20/23) each feature arrived in.

3. Baeldung

   One of the largest archives of worked, up-to-date tutorials for Java and Spring.

4. Can I Use

   A table of which browser version supports which web feature, weighted by usage share.

5. CSS-Tricks

   Two decades of CSS technique, whose Flexbox and Grid guides became widely cited references.

6. FastAPI

   Derives validation and an OpenAPI schema from type hints, and a working test UI appears at `/docs` by itself.