@OP
the meaning of OP is, on forums, original poster. It means that I am referencing the first post of the thread, or sometimes the first person to Necro a thread from a long time ago. @OP means that this post is directed to the OP, “at original poster”
Especially in the PVP forums it means overpowered. as in “Rogues killing you in 2 globals is quite OP”
writing TLDR is usually done at the beginning or end of a post and it means “too long, didn’t read” it’s usually a shorter 1 or 2 sentence summary of a longer post for those that are in a hurry or just dont want to read everything.
TLDR : - OP = original poster, TLDR = too long didnt read.