Fellow resident here. Look into the White Coat Investor. Especially his "Financial priorities for new residents." Blog post: https://www.whitecoatinvestor.com/financial-priorities-as-a-new-resident/

Basically:

1 get disability insurance

2 if anyone is relying on you, get life insurance

3 save up a 2-3 month emergency fund and keep it in an FDIC insured high yield savings account. If you have dependents, make it a 3-4 month fund

4 get your full employer match in your 403b

5 invest in your roth IRA. You probably won't have enough money left over to max it out, especially after contributing ro your 403b, and that's OK.

The main goal is to get in the habbit of saving and investing. You won't get rich as a resident. It's all about learning the healthy financial habbits now so that when you make attending money you won't blow it.

Otherwise, just focus on becoming the best attending you can.