What makes a good spaced repetition system? (WaniKani)

This is part 1 of a ~3 part post. This part explains how WaniKani works through my first experience and follies using a spaced repetition system. Japanese is one of the world’s most difficult writing systems. Compared with English, Hiragana and Katagana are simple phonetic alphabets. Their pronunciation is always consistent, and across both alphabets there’s just ~92 distinct characters plus a…