I know a few of the symbols, mostly to check if I can actually stick the clothes I'm buying in a washing machine or if they are effectively a single use item (for me). After checking I can wash them, the most important value after that would be the temperature, which is no longer readable. I say that, but I stick everything at 30 anyway... (Alright, some things I know are safe to wash at 60deg, like bathroom towels, so they get the extra heat)