jumping in to say feeds are kinda like lists on twt, except it looks for specific keywords/tags. i think you need code to make your own, but you can search for feeds other people have made by clicking the # icon on the top right of your home page. pinning feeds will add it to your home page

ren u are the best

if you don’t want to add the feeds to your homepage tho and just want to view them all from your “following” feed, go to settings > following feed preferences and turn on “show posts from my feeds.” this will show you posts from people you follow + feeds you saved ☺️