Before submitting, I often check for typos and grammatical errors and fix them in the editor. An error may escape me a few times and being the perfectionist I am, go and correct it.
Yes, of course. See, i never over read my posts before submitting them, so when i read them to make sure they are perfect when they are post, i sometimes find errors which i try to correct ASAP.
For the most part, I'm my own spellchecker. I always scrutinize my posts for mistakes in spelling, grammar, and punctuation. In the event a mistake escapes me the first time, I always go back and correct it if I can.