I want to up my game knowledge and to learn more about the add-ons and what they do

Hello i am looking to get into comp dbd after putting about 1500 hours into the game i really enjoy it and want to see what the comp side of things are i would like to call me decent at the game at best i know most of the perks when playing against them.I would like to say my game knowledge about loops and pallet placement are pretty good