I really wish I could remember the first year that I began using King Schools for studying aviation topics. It may have been studying for my private in 1984? Definitely for my instrument in the 90's. It is great to see you still flying as it is a Stearman, Cessna, Piper, Money, etc. Here we are a few years (read as decades) later and your just as helpful with my refresher as when I first cracked the books (or there about).
Airport Signs, Markings & Procedures