Hey @Spencer Gregory!
Kudos to you for getting started so early into the game! Regardless... Hope these answers to your questions help you have a more clear state of mind when making an educated decision on the route you want to take getting into this;
1. STRs will only be passive if you have a management company managing everything for you. But, still won't be entirely passive as you will need to deal with HOA/Townships/Counties to make sure you are operating legally. Doesn't change often but you need to keep up on this type of info as if you are operating illegally your permit to operate can be revoked or you could potentially be fined.
2. House hacking is one of the best ways to get into real estate and build wealth over time. Of course, you are not going to be seeing the type of cash flow you would see on an STR but it is still an incredible start for anyone your age to own more than one unit and be renting them out on a medium-term to long-term basis. Also, not to mention you have more security going this route and more loan ability if you are acquiring more than four units at a time.
I hope this helps and if you would like to talk more please do not hesitate to reach out to me! Keep moving forward!
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Josh