How many recommendation letters?

Hi, I’m in the midst of getting everything sorted for transfer and I was wondering how many recommendation letters I need. I am a second semester (just started) freshman and I’ve already been able to ask one professor for a recommendation letter. I was wondering if I needed to get another recommendation letter from a professor at my university or if I could just ask my high school teacher/counselor? I ask because most universities I am applying to require two recommendation letters.

Also, I have a recommendation letter from a former boss where I used to intern and I was wondering if I could just send that with my transcript as well.

Thank you!

Professors (or people that have taught you in college) and no one else. Unless the university lets you send supplemental reccs but other wise nope.