New Player Seeking Help

Simply said, Win the game or die trying ¯\_(ツ)_/¯
Just know all the advice I give may not work for you.

Recoils mastery

If you really want to improve, dive in training mode and master the recoil of some weapons. (this will be easier when the improved training modes comes out)

Optimize Pinging
Of course, ping anything (don't spam ping)  that could be useful information, the ping weel gives you a lot of option to ping, so try to optimize pining.

Game knowledge.
Know the map, and before starting a fight think how the enemy will move/react when the first shot is fired.
Will they run, hide or engage you, are you able to take the high ground and can you fall back when needed?
A mistake a lot of players make is not falling back when they are going to lose the fight or just have no escape.

Know the optimal range of weapons 

This goes hand in hand with recoil control and will make sure you do more damage but also uses the weapons correctly.
There are plenty of guides online that explain weapons in detail.

Teamwork

I cannot say this enough and I'm even guilty not of doing this.
Make sure you are in a few seconds of your teammates, when a fight breaks out and you are caught out of position or a teammate they can just engage en rollover your squad before you have time to get in a good position to fight back. 

Watch steamers
If you like to watch Apex Legends streamers, do this.
They also provide Real-time examples of fights and give tips and tricks.
You will get a lot of game knowledge because of this and your decision making will be better because of this.

You might find also some extra tips and tricks here: Tips, Tricks and cool stuff.