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.NET fundamentals. Compiles + runs via the dotnet CLI. On Libre Academy you learn C# for free by writing real code in an in-editor workbench, graded by hidden tests (desktop app (native toolchain)). No paywall, no sign-up.
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C# courses
- Csharp Challenges · C# · 120 lessons
- Exercism C# Track · C# · 178 lessons
Helpful reading
Why passive video doesn't make you a programmer · Bring Your Own Book: turning any PDF into a course