2LLL, 3LLL, 4LLL, etc mean it takes 2,3, or 4 "looks" to solve it. Say you orient edges, orient corners, permute corners, permute edges, that means you are solving in 4 looks. The quick way is to solve using 2 looks, and to do that you learn all 57 orientation cases, and all 21 permutations. However, you can et a 4LLL and 3LLL by learning just a few of each. Read through this forum and you will learn a lot about the LL. Good luck.