My interest in GCA started with yardage books. I loved collecting a reading yardage books, or finding similar online course tours for courses I had not played. Going through a yardage book, thinking about how best to play the course (assuming perfect strikes every time, of course
, got me wondering more about how each hole and strategy was designed.
My next, further, foray into GCA was reading a couple of readily available books, 'Anatomy of a Golf Course' by Doak and 'Golf Architecture' by MacKenzie. The most important thing I gleaned from these books, as far as furthering my interest in GCA, was the emphasis placed on playability for all that was a focus of both Doak and MacKenzie. The idea that hazards are there to provide choices, not merely punish the golfer, is one that many players don't get (in large part because many course don't get this). I loved this idea and it became a large part of my assessment of new courses and how they're played.
I don't know nearly as much about greenskeeping, but, as I play and assess more courses architecturally, I find myself truly understanding how much greenskeeping impacts that idea of playability I mentioned above. That is not to say that I really understand how greenskeeping really works, just how it impacts the course. I'd certainly be more interested in learning more about maintenance and its hows and whys.