Reddit is a large community made up of thousands of smaller communities. These are sub-communities within reddit known as "subreddits", created and moderated by users like you, dedicated each to certain topics or ideas.
Once you're comfortable navigating reddit, take some time to remove subreddits from your front page feed that you're not interested in, and follow others that you are. There are communities for almost everything under the sun! Try /r/random or /r/all to help you find new communities.