Well, in your main page (the home button) you... do stuff, if you feel like drawing with pixels, do skins for players or mobs, if you're a coder, make a datapack, a mod or anything in between, or simply hang out and take an eye to anything that catches your attention, another thing is you can't do plagiarism, meaning that you must not take stuff from others just to post them again in your page, be a little creative :), well, in case you want to make that sort of stuff of course
So have fun m8