Probably most people wanting to learn Win32 in 2019 have inherited a legacy codebase too large to convert. Personally I work in wxWidgets but occasionally it's

Probably most people wanting to learn Win32 in 2019 have inherited a legacy codebase too large to convert. Personally I work in wxWidgets but occasionally it's useful to dig into wxWidgets's internals which are (for the Windows version) written in Win32.