It's a big ask to suggest reading through this, but reading http://blog.ploeh.dk http://blog.ploeh.dk starting from around about 2013 is illuminative. Seemann

It's a big ask to suggest reading through this, but reading http://blog.ploeh.dk http://blog.ploeh.dk starting from around about 2013 is illuminative. Seemann basically wrote the book on dependency injection in .NET, and has been a pretty big evangelizer for clean object-oriented design. Some time during that year, though, he discovered F#, and from 2014 on his blog has been increasingly about functional rather than object-oriented design. By following the transition you get a pretty good luck at things (ML-style) functional programming does well, since it's basically a journal of a serious expert in object-oriented design learning switching over to the functional paradigm.