Focus on concepts rather than recipes! It's so much easier and faster if you get them confident in drink routines for building blocks (common lattes, fraps, how to do a really solid steam, etc), so that once they're on the floor if they forget the recipe for, say a cinnamon dolce latte you can just say "like a mocha, sub cinnamon dolce syrup add sprinkles," or a café vanilla frap is a "vanilla bean made with frap roast," etc. On the floor questions are a lot easier to explain once they know the building blocks solidly without tutoring every time.
EDIT: Forgot to add a couple of websites I give all my green beans, both made by people on this sub I believe!
$1 is a good resource for when you have those annoying customers who want to know what the nutrition information would be for their wild orders—just type it in and it breaks down an approximation of what's going on!
$1 is a literal godsend for dating backups and for studying recipes/builds via the cheat sheet. I just write them on scratch paper and tell them to keep the tabs open on their phone, lol.