The algorithm for the feed learns what you like from your actions on the site. Most of your actions impact the posts that you see in the feed. Liking, Commenting, Sharing, Saving, or Tipping posts will tell the algorithm to show you more of that type of content.
You can also unfollow Topics and Profiles that post content that you don't enjoy, or block them from showing up in your feed. This will limit their reach to you.
Access a post's Options menu and choose "I don't like this". This will hide the post in question and you will find different options available to limit the encounters you have with those kinds of posts. You can choose to unfollow the topic or profile in question, see less from the post creator, block them outright., or report the post if it breaks our Community Guidelines or Terms of Service.
You can also find the option to "Improve my Feed". This will offer you a number of new Topics or Profiles you might be interested in following.