I mentioned one of my goals for the current quarantine is to improve at first-person shooters. Here are some things I've done so far that have helped, coming from a non-FPS-focused gaming background, that might be helpful in case you have plans to play any upcoming FPS games

1 - lowering mouse sensitivity. Higher sensitivity means you can't be as precise with small adjustments to your aim. To lower it, figure out your mouse sensitivity, your Windows mouse settings, and your in-game sensitivity, and compare those to pro players' settings via Google

Keep in mind this requires you to have enough mousepad/deskspace to allow yourself to move your mouse more. Also, pro players tend to play with VERY low sensitivities. You might not need to go *that* low, but if you're casual, you probably want it lower than you're currently at.

2 - aim trainers.

In any shooting game, you spend a LOT of time *not* shooting. Whether it's holding positions in CSGO, or looking for loot in Apex, you basically don't shoot that often. And, if you're bad, you shoot even less often than those people who win gunfights.

Aim trainers are games that pit you against different scenarios such as pop-up targets, moving targets, etc. to practice your clicking accuracy.

A free easy one to try out is Aimtastic on Steam. Give it a try to see if you even enjoy aim training in the first place.

If you find yourself enjoying aim trainers and the feeling of improvement, then I recommend KovaaK's 2.0, which is $10 on Steam. It's a huge sandbox game with hundreds (thousands?) of custom user-made maps.

Then, you can follow this coveted program: https://www.dropbox.com/s/vaba3potfhf9jy1/KovaaK%20aim%20workout%20routines.pdf?dl=0

In researching how to improve at Apex Legends, every other Reddit thread pointed to this guide. I'm starting out from the Complete Beginner portion and I'm about a week into it. I set aside about an hour a day for this, but I don't mind, because it's fun and not a painful grind.

Another cool thing about aim trainers is that there are usually settings for you to match your sensitivity according to the game you play. So my mouse is 1800 DPI, and I run 0.8 in-game sensitivity in Apex Legends - and I can choose "0.8 Apex Legends" in KovaaK aim trainer.

I have to stress that this might not be for everyone, and you should give free alternatives like Aimtastic a try before committing to KovaaK's. I've personally always enjoyed improvement, and aim trainers are new but fun to me, so I can see myself committing the time to train.

3 - I just thought of this one, but try to understand how aiming and movement works in your game. In CSGO, if you're moving, your bullets are going all over the place. It's best to stand still before firing.

In Apex, the opposite is true. You can move while shooting.

You can also try figuring out how crouching and jumping affect your shots. Firing ranges and practice modes in the specific game you want to learn are super valuable for this. Which leads to my final tip...

4 - learn your gun recoils in your specific game! I've actually spent hours upon hours just playing in the Apex firing range to figure out "what happens if I just hold down left mouse button?" Each gun is different but there are some generalizable conclusions I can remember.

For newer players, "recoil" is what happens to your aim if you keep firing in one held-down LMB click. In games like Halo, the bullets would go exactly where you're aiming, so you can unload an entire assault rifle clip. This isn't the case for Apex or CSGO.

In Apex, your crosshairs will basically flinch or recoil in certain directions, so you have to tug your mouse slightly in the opposite direction to compensate. But your bullets go wherever your crosshair ends up. The crosshair itself just bounces around as you shoot.

In CSGO, the recoil does *not* follow the crosshairs, so about 8 bullets into a spray, you'll see that your crosshairs and bullets aren't aligning. But you can still learn the recoil and compensate by tugging the mouse in the appropriate direction.

In Apex, it's pretty important to control the recoil of an entire clip, because it takes a full clip of damage to down someone.

In CSGO, you can probably get away with learning the recoil for the first ~6 bullets, because you can usually kill people in 1-3 shots.

An invaluable tool for this is the firing range in Apex, or custom workshop maps in CSGO (just search "recoil" or "aim training"). For CSGO, I honestly just learned to pull downward for the first ~8 AK/M4 bullets or so, and that helped me win low-level gunfights more often.

And that's pretty much all the advice I have. These are some of the things you can look to if you'd like to get better at FPS. I'm not an accomplished player by any means, but I AM lazy, so I'll always find the easiest and fastest ways to improve at something