@PauloB This isn't like other sites where you try to get as many likes as possible, or gather the most followers. You interact with people who have similar interests, perhaps.
As an example, say you like dogs. You post a photo of your dog who is a German Shepherd. You'll want to tag it #dogs or #DogsOfCoSo. If you search either of those two hash tags (leaving off the #), you'll find other people who have used them. Read the posts and strike up a conversation.