Typically, blogs on this website are used for a variety of different things. I think Blog folders could maybe branch it out to more.???
Basically, you could put the type of content your blog is into a folder on your profile. It wouldn't be like categories. I think categories are more for scrolling through the blogs for what it's about, but folders could be what type of content it is. Like, I could make a folder for all my blogs about my daily life, articles, books, fan fictions, random content, and more. So, if someone likes an article I write on blogs (because I'm a nerd and idk where else to post articles I want to write), then they can go to my profile and go on that folder to see all of them. Does that make sense? Does that sound like a good idea?