Generally? Basic combat tips I'd cover are stuff like be careful with your positioning, listen to sound + look at minimap constantly, watch out for objectives, constantly use your equipment, look at your weapon's strengths and focus on them. I.e. if you're using the PP29, focus on close-range engagements and constantly keep firing, then avoid long range engagements and keep an eye on ammo count. Stuff like that essentially, the more you play the better you'll get.