What Are Your Top Tips for Beginners?

Forgot to mention the one thing that really helped from being a hardstuck d4 to eventually peak master: Every time you die, calm down for a couple of seconds and then try to really objectively and unbiased evaluate what you did badly (and well) in that situation and what you could/should have done differently. I can strongly recommend to play with some kind of recording software on and go back and look. You will learn so much when you actually can see what is going on during the situation that lead to your loss, or any other unfortunate events for that matter.

I think most of the people who come to this forum and blame their teammates for their failures would learn so much from this. Some things you will see in those replays is that very often, situation when you instinctively wanna blame your teammates, happen because of totally understandable and unfortunate events that happened around you but didn't directly affect you/you were unaware of, perhaps because you have bad game awareness. Its easy to think that YOU are the center of the universe and that everyone should adjust to you which ofc is a silly thing to think.

Just a concrete example, which actually is a bad habit that I pretty recently discovered in myself and work on to correct: 

its easy to pay no attention to your teammates health meters before you call for a hardpush or just start playing aggressively. When you play as a full premade squad and really tryhard, your shotcaller may call for an all in where everyone just go in regardless of individual status, but among randoms or just together with low elo player with low knowledge of this game, you cant expect someone with 50 hp on a red shield is gonna abort his battery just to support your call to hardpush =)