The platform is for blogging about whatever interests you. You upvote to show support for what other people have posted, and you can earn a small curation reward for upvoting. People upvote you based on how well they like your posts, unless they are running vote-bots that auto-vote everything anyway.

You post whatever you want, provided you use appropriate tags. Tags should relate to the content, and a list of popular tags is always available here if you need some idea what can draw attention. The first tag is a permanent category for your post, so choose wisely.

I suggest reading some articles here or elsewhere on the web about how to format posts in order to make them easy to read. I don't mean to be overly-critical, but your posts are somewhat disjointed and hard to follow. Good paragraph structure will go a long way toward attracting readers.

Some helpful posts from other Steemians:

Steemit Markdown Basics for Beginners
Updated Steemit FAQ part 1
part 2
part 3
part 4
Headers and White Space