Gunsmith recoil
Build for the range of the map. A long barrel in a hallway still loses to a faster SMG.
Attachment notes sit in more game information.
Slide peek
Slide to break a pre-aim, then shoot. This resource covers when slide-cancel just throws your gun up.
Do not slide into a stacked angle with no flash.
Ranked maps
Hold the power position your spawn actually reaches. Additional game information marks common head-glitches.
If you die the same way twice, change the route, not only the gun.