English Grammar For Beginners

So I've noticed that A LOT of stories on here have less than perfect grammar... There are those perfect works from heaven with amazing grammar, but the latter dominates so here's some help! It may also be useful if you're trying to learn English! (P.s. If that applies to you, I wish you luck and I hope you can understand what this says. Learning a new language can be difficult but I know you can do it!)