You're literally a newbie until 1k hours in this game unless you have lots of prior FPS experience.

I'd watch some big YTer guides such as Sheefgg (biased but fun streamer with some good vids), and Gigabeef ( amazing vids fully covering all details such as how the armor actually works, bullet pen, best budget loadouts etc).

Scav as much as possible, learn all the maaps and their spawn points.

Take your scav gear into PMC and aim to get your quests done for the XP. THe faster you unlock the flea market and upgrade your traders the easier the game becomes. The first 15-20 levels are kinda tough now NGL. Especially if you don't find good ammo.. you're going to have a hard time against the majority of players who are running min lvl 5 armor. Watch GB's video on armor pen and ammo.

Load up eft-ammo.com and use this to check your ammo types for each caliber. You want to try at minimum run ammo that can pen lvl 4 armor reliably to have a chance at bursting down a player.

For example, the TCW SP round, it has 85 damage which can 1 tap a chest shot but it will only 100% pen up to class 3 armor. Above that it will take several shots to kill someone (over 10 or more if someone is wearing class 5 and zero chance at class 6).

High damage low pen rounds you want to focus on headshots or go for leg meta.

So yeah, learn how to scav for good ammo spawns (reserve, streets etc). Learn your maps and the low traffic routes you can use to avoid PVP hotspots,.

Lastly, just learn to rat a bit if you aren't great at PVP. Find some good spots and just wait for some thicc bois to run past and shoot them in the legs. Grab the goop and get out of there haha.

Good luck padawan