There are Armor Class from 1-6
Learn the Bullets, you can have a really good Gun with bad Ammo and cant kill anyone
Learn the Spawn and run with the "Spawn Flow" if you wanna avoid People
Learn the Map Customs, its the Beginner Map with alot of Quests also with good loot spots
Open your 2. Monitor or on your Phone the Map you play so you figure out where you are
Don't play Labs at the start believe me its not worth
Watch Videos from Pestily, its really helpful
Learn the Exits, some are not Open everytime
Watch Videos how to Mod your Guns
Don't loot every Item, some are just dont worth it to take with, keep an eye on the flee Market which Items are Valuable.
Join people who are also Beginners, i dont recommend going with good Players into a Raid because you learn nothing, the best way to learn is by playing solo or with other beginners.
The first 300 hours can be frustrating, but believe me its a good Game.
Have fun and survive!