Today, I will show you what I think you need to do to post good comments.
First of all, you definitely need to use capital letters when it is the start of a sentence and when addressing someone, a place and even yourself.
Secondly, you always need to use punctuation. At the end of a sentence, you need to put a full stop! Also, you need to add commas when you are listing things. (When you see a comma, it means to take a little breath.)
Finally, you need to edit your comment and make sure that it makes sense by reading it out loud or asking a teacher/friend check it.
Make sure that you are posting positive comments, and everyone will be happy!