Make sure not to pressure yourself too hard!! There is honestly a lot to learn and keep up with -- I definitely felt overwhelmed when I first started training. Don't expect yourself to know every single thing overnight, and don't be upset at yourself if you make any mistakes.
Starbucks has its issues but overall I would say it's not half bad as a starter job bc it helps you get experience in a lot of areas that would look good on a resume.
Congrats on getting hired and good luck bro !!

Another tip, don’t try to study outside of work. Practice will get you there as long as you pay attention to the details on register (basic drink combos) and pay attention when partners give you tips. Otherwise you’re good!