Just a couple tips that would have been helpful when I was learning. Some may seem obvious but to new players it might not.

Sites - A site is the site on the left when defending, and right while attacking. B site is opposite.

Heaven - some sort of raised area that can be got to without abilities/parkour

Hell - under heaven

Long - any long part of the map that goes to a site. Usually pretty straight. Best example is Pearl B long, its where attackers usually push.

Elbow - somewhere with a bend like an elbow

'plant default' - where people usually plant the spike. Its usually somewhere that has good cover but isn't the easiest for defending the spike

Default - pushing all across the map in an attempt to take space. This is usually done in patterns such as 2-1-2.

Saying an enemy players agent and then a number (e.g. jett 120) is how much damage they did to the player

If anyone has more feel free to comment! Hope this helped!

Edit - clarification about default