The Home page is nothing more than the web page that automatically opens when you launch your web browser or hit the Home button in that browser.
Now, I’m going to assume that you’ve actually set this page to what you want it to be. If you haven’t set this up, I can’t really give you the steps as they’re different for each browser program. (Though How do I change my browser home page back to what I want? has instructions for a couple.)
For our purposes here, let’s say that you already set the homepage, but something is changing it. There are a couple of reasons why this might be happening.