There is selective aggression which you want and aggressive donks.
Avoid playing the aggressive donks. You'll find the aggressive donks in
freerolls and low stakes tourns but for some reason they "mysteriously" rarely show up to the higher levels.
Those are the folks that go all in with a small pair with like 50BBs+ or some drawing hand like AK AQ because they're scared to play a flop and for some reason still haven't learned when they're beat on a flop and won't let go of a hand so they just try to simplify the game by going all in or putting pressure on folks preflop.
When I used to play, I knew what levels I needed to play at to avoid these folks live and online so that's the other thing I would look into by doing research by watching a few cash games or tourns before you even sit down at one so you know who you're playing.
If you can, just avoid freerolls and low limit games with those type of players. You're better off if you can pay $20-30 a month and play against bots that can teach you how to play a decent game like at Poker Snowie or Advanced Poker Training.
So avoid playing them if you can and then you should work on spotting them at the table if you can't.
They're easy to spot, I don't even have to see a hand played. If you show up to a table and have a mountain of chips at a certain stage of tourn when you shouldn't its because 90% of the time they put the money in bad and got lucky. If I see you actually know starting hands and what you're doing and I actually care then I'll look you up in
sharkscope to see if your profit graph looks like \ or with craters and what type of tourns you're playing.
Freerollers are not winning players in my book because you can't lose lolol, sorry. Then you have to see what type of tourns they're playing. Are they playing everyday regular top 10-15% cash etc or some special online everyone makes the money special promotion tourns or some private tourn, stuff like that.
The only real reason to play with that type of player is to get over your tension, I wouldn't say fear but you have to know how to deal with these types of players but once you get past that then there's no reason to really play them besides maybe as test subjects for studying the game.
I would focus on learning to spot them, you can try the advice of daniel:
When you play against aggressive players, you will face difficult situations with your average hands. So you should play with a tight range and you can defend your hand easier. And you also can trap them when they are going to play very aggressively.
that's the ABC123 straight forward approach like if you were at a cash game but I don't know about that if its a tourn with the blinds coming around after you.
In that spot you're going to have to mix it up with them when you really don't want to and you're going to have know their range to have a clue where you are and on top of that there are going to be times where even if you have the best hand, they're still going to get lucky on you.
I saw a hand yesterday where a tight player in the Cardschat freeroll had a aggressive donk to their left and waited for a premium hand and went all in with JJ preflop with like 15BBs and the aggressive donk called with 5h4h and hit a straight flush on them. lol I mean think about it, 5 HIGH. lol.
Do yourself a favor and avoid those people lol they can't win constancy nor last for long playing cash games or tourns that way where they have to put money up, lol.