Tricks of the trade.

Forgive me if I posted this in the wrong area but, is anyone able to help with advice on Halo 5 PVP? I used to smash heaps of Halo 3 and a bit of reach but am at a loss with Halo 5.
I’ve watched a few youtube videos on where to look, predictive aiming some weird crouch jumping?¿ but I’m just getting absolutely owned :joy::joy: maybe 5 years of Destiny 1 & 2 with such wide bloom has turned me into absolute trash. If anyone has any suggestions or willing to jump on and check on my game style and offer some advice I’d be extremely appreciative.