Don't stress too much about it. You've done a lot of posts in a short amount of time, not all of them are going to be useful. One of your posts was just a full stop, obviously that's pointless.
Just think about what you are going to post, Learn and help others learn and have a bit of fun and you will be fine and become a valued member here. Most members are cool and tolerant, just relax a bit. As someone else pointed out quality over quantity is the way to go.
I'm not criticising you by the way so please don't think I'm lecturing you, just trying to help you settle in.