I opened this thread in hope of fellow Xenomorph players to share things that anyone should be able to do and should know can be done. Here's my Contribution, feel free to call me a noob and/or complete with your own additions:
Carrier:
In LV-426, you can pick-up ??? Facehuggers in research dome and drop them anywhere on the map, thus being able to hide your traps. Make sure to first make your trap, put a normal hugger in and then drop the triple digit chromosomed facehugger on top
Defender:
Headbutting will make you go through unbarbed cades
Spitter/Sentinel/Drone:
On Prison Station head to chapel and melt the barricades ASAP
Runner/Lurker/Warrior:
Don't fight more than 2 shotgun users, as if you pounce one, the other will have an extremely easy time in PBing you
As a Runner if you NEED to fight a single shotgun user, you can safely slash them once and back off before pouncing them again
As A lurker you can safely slash them twice before backing off
Praetorian:
Heal the Xenomorph with the most Armor at the moment IE: Defender,Crusher, other Praetorians, Carrier
All Xenomorphs:
Don't fuck with survivors if you are two of the following: a/Less than an Elder T1, Mature T2 or Young T3, are alone and away from support, are on fucking Prison Station (They get guns for days), are unrobust.
Queen:
Don't focus on healing a single runner/lurker so he can get those kills in one random spot in the jungle while your T2 and T3 are fighting at the frontline