Show Random Posts instead of Categories

hi there, i hope someone could help me because i found this widget really helpful.

I just want to change the widget purpose to get a list of random post with title and thumbnail instead of a choosen category.

if it’s too hard to make, i would be happy also with a random category solution.

thanks in advance!

https://www.ads-software.com/extend/plugins/wp-category-posts-list/