So I've been reading threads on this website and I have to say that for the most part, the spelling/grammar here is atrocious. Here are a few common mistakes:

There
Their
They're

You're
Your

Its
It's

a lot (not 1 word)

Yes, some may argue that it's just not worth it to use grammar here, and I'll admit I don't always use my 's but at the very least learn to use their, they're and there correctly.

(I'm sure that there are many other words that are messed up but these ones annoy me the most)