So many different kinds that you have likely forgotten many of them.
Try to remember a footwear item or two that you had forgotten up until the moment it pops into your memory today and you begin writing about it.
Can you remember shoes that you lost? boots that you ruined? childhood footwear that you outgrew?
Can you recall times that what you wore on your feet was painful, comfortable, or fashionable?
After you fill the page with previously-forgotten footwear thoughts, illustrate it if you like. Give it a title. Sign it and write the date on it, too.