Title says it all.

In response to feedback that I'm not very... grammatically passable or satisfying as a writer, I'd just like to ask if someone would be so kind as to help me identify problems in my SYW submissions. Mostly so that I can go and do some online search-learning in hopes of improvement.

Frankly I have no idea what the issues are because I have no idea what everyone is talking about since I'm not very G-savvy. Obviously. <_<

Them: You have grammatical issues in your writing!
Me: Okay! *attempts to fix* Is this better?
Them: No, you're still confusing your adverbs with your adjectives and your nouns with your pronouns.
Me: ... What's a pronoun?

So yeah, thanks.

You don't have to explain anything, like I said, self-learning and all. I just need to know where to start.

Okay so. Longer Sample is this post (No you do not have to read it all) and Shorter Samples are in this post.

Final note:
This isn't a critique thing. I'm not asking for feedback on the writing. I'm asking where should I direct my learning capabilities as regards grammar. And stuff.

Thanks again!