Most people need some way of keeping themselves organised. Some people do this digitally, others like writing things down, I really like planner stickers. At anytime I can have multiple projects going on so for me I find planner stickers on a calendar works really well. I can place various styles of stickers for different purposes and having a physical sticker in place means I can always see it and see what I need to do.
Now of course you can buy absolutely tonnes of planner stickers, but I have the means to make everything myself in my home and these are some of my designs. You can see ore designs on my shop here