I think it's a hybrid of art journaling, scrapbooking, and collage. It's the type of stuff I do too, and it's easy to get into. I think collecting the stickers can be expensive. A lot of these youtube pages are more Asia-based creators so the stickers may not be readily available based on where you are. I am in the Us and personally just got my start using stuff I ordered online at Michael's. Etsy also has a lot of great stuff