[2019] Any tips on improving in Halo

Hi Guys! So I have been absent from the halo universe quiet a while, since halo 4 to be precise.

At that time I was about 12 years so I really dont remember that much about how to play not getting my ass kicked 24/7.

With Reach coming to PC and the ongoing flight I wanted to ask you if you have some tips or if you know a good halo youtuber.