Congrats on getting out in front of your credit at a young age. It's something far too few people do. Great advice above from the others.
I wanted to chime in and second what @SouthJamaica said - if you haven't already, join a credit union. For now, join a local one. In time you can expand and pick up a couple more but one will suffice just fine right now. They can be a huge ally in finances throughout your life.
I joined a local, small CU when my mother took me to open an account in ninth grade. Now, at 46, I'm still an active member of the same CU, and it's been an invaluable part of my life. Mortgage, multiple car and personal loans, credit cards, checking, savings, CDs, they've supplied them all. CUs are much more likely to stick with you in downturns than the larger banks - it's a matter of responsibility to their members vs to shareholders.
Stick around here and read everything you can. There is an unbelievable collective knowledge here built upon the experiences of many members, and learning the components of FICO scoring, the ins and outs of personal and business credit, information on mortgages and car loans, will all help you as you go forward and your financial world expands. Welcome to the forums, and by all means ask questions and join in the discussions. It can only help 
Congrats! I got my first CC through my bank (USAA) when I was 18. I started with a $500 limit. Now I'm 21 and with plenty of more cards with a health CS. I would say start through a CU first, and then after 1 year go with Disc/Amex/Apple. Best of luck.
@Harvey26 wrote:@HornedFrog2025 I would look into AMEX they usaully like thin files. Im sure being an AU on 15+ year old accounts with them might even help you out. You probably would have a good shot at the Apple Card when the AU accounts report on TU. FWCCU has a student card but looks like the credit limit $250 so it might be a lil hard to use it on a consistent basis.
As a point of clarification, authorized user status makes zero difference in Amex's lending decisions for a primary cardholder, other than any benefit it may have on one's Experian FICO 8 score - which is only one of the factors that they take into consideration.
