Screen, aim, fire
There's two simple ways to fire your primary weapon here in Brawl Stars, one of which is quickfire, and the other is actually aiming.
Aiming is good if you're after a particular enemy when there's a group, or shooting into the tall grass blindly to check for enemies, but quickfire is usually a good way to go.
Just be aware that if there's a group quickfiring, especially with your super, might hamstring you.
Lying in wait
Tall grass hides enemies, but it can also hide you. Stages will always have tall grass, and moving through it will keep you out of sight of enemy troops.
This is a good place to wait and recover health, but can also be used as a tactic to ambush opponents. Wait in place before blasting off shots.
You can use this to stay close to an objective and jump out at opponents too fixated on collecting things to notice you.
As you do damage to enemies you'll build up a super, which you can use to do massive damage. It's different for each character.
There's a few types of supers. Several are just massive shots, blasts which take out tall grass and do big damage to opponents. These are useful to find opponents who are hiding.
Others will have you run into the enemies to do big damage, but these are good as once you're in there, you can use quickfire to rapidly deal damage, and maybe even earn another super.
Teamwork makes the dream work
In most of the game modes, teamwork will make things much, much easier. Even in the Showdown battle royale, being in a Duo makes things much easier to deal with.
And in Gem Grab, you'll need to work with your teammates to collect gems, and protecting your pals can be just as important.
Don't try and always go solo, as staying near your friends can be incredibly helpful, especially if you're a short range fighter.