This little video is made by a youtuber who does a lot of WoW related content in an intelligent and sophisticated way that usually relates to raiding. He shows how you can improve dramatically simply by knowing various raiding concepts that set apart your average raider from the best.
This video has nothing to do with me, just posting it here as I feel it can help a lot of people.
I honestly think he puts out the best WoW related content on youtube. He does daily news shows, very in-depth class, tanking, healing and DPS guides with commentary from top players and has played in top guilds since TBC.
If you don't know how to setup WoL you shouldn't be using it in the first place. It's really not that hard! Also not sure why he didn't just make a live report, it is much easier imo, as you don't have to delete the combatlog everytime you do it.