There are some aspects of logic that aren't required to complete a randomizer seed, but can be useful to know in competitive play.
Spirit Temple Logic
Spirit Temple logic is a complicated beast due to how many paths you can proceed through the dungeon by. For racers who want to ensure they are understanding the logic the seed is intending for them ToxicOxygen has created a comprehensive document describing the logic when playing with weekly settings.
Logic Files
The source code on GitHub is the best source for all of the logic in randomizer. Nothing is more complete than the actual logic files used for seed generation. Careful examinations and comprehension of these files will ensure you are never tripped up by logic you come up against in the randomizer.