you’re gonna feel really bad at your job for a few weeks , even months . but after like (i wanna say 2-3 months) everything will click in . good luck !

This has been an invaluable resource for me:
https://www.reddit.com/r/starbucks/comments/p1ik3o/the_last_infographics_i_will_ever_post_leaving/?utm_medium=android_app&utm_source=share
Be sure to scroll down to the OP's link to their Google Drive, though. The infographic there was updated to correct a few errors. Don't use the one uploaded to Reddit. But it's a great way to study the drink recipes at home.

The store will also have iPads with an app called "Store Resources" that has all the drink recipes in it. You can study those on your breaks or before/after your shift. If your SM/SSV(s) are okay with it, maybe even use it at the bar for practice drinks.

Honestly it’s a practice thing. The more you bar the more you’ll be in the mindset/find a groove and it’ll become second nature. I say this to just about everyone who’s new. Once you know how to make a basic vanilla latte you know how to make half the menu it’s just a matter of substitutions. The difference between a vanilla latte and mocha? Mocha instead of vanilla and add whip. Same pumps same number of shots unless otherwise specified. Same goes for iced drinks. For syrup pumps think of going up stairs. You add one pump for the next size. Grande to venti iced is like going up one of those steep stairs that you hate because you don’t know how far down to go. There are exceptions like in americanos you add a shot and macchiatos you go down one pump.