This covers the essentials of modern C++ from C++11 through C++20: auto type deduction, lambdas with various capture modes, range-based for loops, uniform initialization, and move semantics. The examples are practical and show before/after comparisons that make the improvements obvious. You'll want this when writing or reviewing C++ that needs to be idiomatic and efficient rather than stuck in pre-2011 style. The structured bindings and move constructor examples are especially useful since those trip people up. It doesn't cover every modern feature (no modules or coroutines), but what's here is the stuff you actually use daily.
npx skills add https://github.com/thebushidocollective/han --skill cpp-modern-features