Key things
-Pick up a precision weapon
BR, DMR, Carbine, doesn’t matter make sure you grab one as soon as you can off spawn so you can defend yourself at a distance
-Don’t chase
If you’re shooting someone and fail to get the kill because they’ve ducked into cover, don’t chase them, either A: position yourself in an advantageous position for when they move from cover or B: move onto the next target.
chasing after them will only get you killed
-Learn the maps
This will be a little less necessary for H5 since the game essentially tells you where and when things will spawn, however its always a good idea to learn the map layouts and jumps and routes, learn choke points and how to get your opponent into them
-Grenade placement
I suggest going into a custom game and just throw grenades to learn how they work, their distance, how they bounce a perfectly placed grenade can turn the tide of the battle
-Communication
I know you said you think you will get hung by a rope for speaking, but honestly, don’t let that bother you or deter you. People are jerks, plain and simple don’t listen to them and just do your thing, call out communicate even if no one else is talking, they can hear you and giving your team information is the difference between winning and losing
-Stick with your team or a team mate as much as possible
Don’t stray too far from your team,and get caught out in 2 v1 or 3 v 1 positions you won’t last long
-Teamshot
Focus fire on targets, if you see your team mat shooting someone and can put fire on that same player do it, the faster you finish off one enemy the sooner you can move to the next, team shooting in halo is very important (IMO)
I’m far from being a pro player, I’m average at best, but hopefully these suggestions can improve your game