I've noticed that so many players comm something along the lines of the following: "They are here!", "On me!", "I hear them!", etc.

Why this is bad: Saying "here" doesn't tell your teammates on the opposite side of the map where exactly the enemies are coming from. Saying "they" doesn't tell your teammates approximately how many you heard.

Comms should be quick and concise, but should give as much detail as possible.

If you hear multiple enemies, try to count the # of footsteps you hear and then comm their location and how many you heard. This is so important as you climb the ranks, as it'll clear comms ASAP and provide the info necessary for your teammates to rotate accordingly.

That is all. Happy Friday :D