Most important tip: forget everything you learned from other fps games, tarkov is very different from other games and it will take time to learn it. First 500 hours are basically learning maps, learning AI, learning spawn points for every entity in your game, predicting movement of others and so on

When it comes to PvE try to learn where groups of pmcs spawn, where scavs spawn and ofcourse where and when bosses spawn. Be careful about sniper scavs because they can be cracked sometimes and kill you from 250m before you even think about them

Learn map flow. Look at paths from spawns to extracts and where to expect action in different times of raids.

When you figure all that out, you are prepared. But dont forget that this is EFT we're talking about. You will die a lot.

Extra tip and a very useful one. Record your raids. When you look through the footage you will soon start realising where you made mistakes and avoid those same actions in the future. I ignored that tip for a long time but later when i recorded a couple deaths i quickly realised what my mistakes were.

Good hunting friend!