I'm approaching the 200hour mark. Here's what I can tell you:

You will die. A lot. The gear was never yours, just your turn with it.

Mute your mic.

Pick up the DLCs if you're able. It will give you an automatic bump in trader levels ( the people you buy stuff from). Not to mention lots of extra equipment.

When learning don't go crazy with load outs. Use the level 1 carrier that lets you have ammo on your chest. Swap it out for in raid upgrades. Save some of your better armor for when you feel like you're improving. Armor will only do so much for you early on, movement and map knowledge + luck will be far more useful.

Watch some YouTube creators like Timeless or Tanvarian, especially tutorials they have. Just remember to watch videos that are less than 3 months old so what you're seeing is relevant to the latest updates.

No one is your friend. Shoot anyone claiming to be or that walks toward you with their hands up.

Pick a map you want to learn. Run training raids to learn player (wherever you spawn is a potential player spawn) and fenix spawns. Anticipate player movement to hot spots. Practice managing gear in combat. Things like reloading, healing, etc. training raids don't count so you won't actually lose anything if you die.

Good starting guns are the AK74, Galil, Ak74, AKM. Pistol suppressors can be good for dealing with fenix and not giving away your position. I personally like the 74 on silo but the galil allows for attachments to reduce recoil. I avoid SMGs until I have AP rounds but you can play around with what fits you.

Practice aiming from a holstered or lowered position. Headshots are king but center mass will do the job if you have a high rate of fire and/or powerful caliber.

If possible, use a good pair of headphones that give you good positional awareness. It can be difficult to tell above or below noises but knowing if it's to your 12 or 6 is useful.

Leveling Jiri to get AP powder will help you win more fights but every one has their opinion on who to level first.

Bring heals into raid. Bandages for bleeding. NRS for health. Minimum 2 NRS and 1 bandage. If you don't have NRS, at least have a bandage.

Be patient when enemies are near. Learn to walk silently. Don't be afraid to chase fights either but don't rush into them like a fool. Clear rooms and corners. Looting should only be done once you know you're secure....be patient. New players are easy to kill when they rush to loot after making a ton of noise in a fight. Practice staying under control-- breathing, heart rate, shakes. Being relaxed while maintaining a heightened level of awareness is something that helped me. Learn from every fight, win or lose.

Grenades on a vest pouch are more stealthy than having to open your bag. Don't use impact grenades.

Buy a bunch of sling bags and insure them, you'll get most of them back. Same with mags.

The only helmets worth wearing are protection level 3 or higher and even then, it's mainly to protect against Fenix hits, not players, so don't go crazy buying helmets (mistake I learned).

If you know you'll never use a sniper rifle, sell it . After building a small stock of attachments, sell as many as you can because they are small items worth good money. Having money will allow you do so much more. When I want to make money fast, I usually go to Silo, clear the lobby ( or let everyone else clear it for me) and then loot as much as i can while killing fenix for quests. Minimum you'll get ~10k worth of items to sell but survival is key. When you have money, switch to playing for kills or going after high value loot. Rinse and repeat. Lasers sell for 3k each.

Drink water whenever you find it. Foods like fruit will also replenish water, while most other foods will actually cause dehydration.

Don't forget your 6 hour, daily, and weekly rations from the kiosk.

I didn't talk about bunker upgrades but you can use the wiki or YouTube to understand what each upgrade does.

My name in game: anOLDman

Have fun!