Here's some other writing tips that will put you ahead of - I don't want to guess what percentage, but I'd say a large percent - of other people out there. Learn these basic things that somehow either aren't being taught or aren't being remembered:
your vs you're - your is belonging to someone or something, like your dog, your house, your friend. 'you're' is a contraction - that means you're shortening two words into one - you're shortening 'you are' into 'you're'. Example 'you're going to pick up dinner tonight, right?'.
it's vs its - its is a belonging to of sorts too, like 'the dog was chasing its own tail', or 'the car broke down due to a failure in its electrical system'. Once again, it's is a contraction - a shortening of 'it is'. Example 'It's going to be a hot day today'.
And since I mentioned 'too' above - I see people constantly typing 'to' when they mean 'too'. 'To' is what I call a 'connector' (I'm not an English teacher). Use it like "I'm going to the park", "We're going to a movie". 'Too' is a comparison - it's too hot, that's too bag, it's too far.
They're/their/there - they're is a contraction of 'they are' - 'they're going to California next week'. Their is an ownership type of thing - Their house is for sale. Their dog is sick. There is usually used instead of a place. "Yeah, he went there last month". Then again, it's been used as a consoling word - "There, there, you'll get over it".
Commas - I don't want to give a ton of examples, and what I'm about to say doesn't *always* fit or work, but generally it does. A lot of people seem to 'salt and pepper' a sentence or paragraph with commas, or at the other extreme, type long run-on sentences with few commas at all. Generally speaking, use them like this: if you were saying whatever you're writing out loud, and you'd pause just a little bit, put a comma there.
Oh, and 'supposably'? That's not a word, yet I hear people say it all the time. It's supposEDLY. And 'I could care less', as has been covered in this forum, should be 'I couldn't care less', because you're really trying to tell us that you don't care at all about whatever it is.
I could go on - but if you get the above nailed down, you'll be ahead of a lot of people and their writing.