As a beginner, I'd like to highlight two pieces of advice.
1. Familiarize yourself with the GTO charts to get a rough idea of what hands you want to play, especially cold calls and 3-bet pots. If your hand has less than 0.2 EV/100, you don't need it. Get rid of those stereotypes about the cutoff/button having to open a lot of hands (especially in freerolls, where people "defend" 100% of their range in the big blind and almost 70%+ in the small blind) – without understanding postflop, this will only take away your chips time and time again.
2. Learn to stay calm and manage tilt. It's best to prepare yourself for the worst right away—your AA will be destroyed time and again after a 4-bet by some 74-suited hands, simply because the player felt like playing that way, even though they haven't put in a cent and aren't risking anything. If you can't overcome this and come to the realization and acceptance that this can and will happen, your mental capacity may not be able to handle it.
I wish you the best in your endeavors, and may luck smile upon you.🖤