Resources for learning to work with pendulums

Hi! I've always been interested in pendulums and was planning on getting one in the future, but I recently bought a mystery box that ended up having one, so I thought "why not just start now?", but I checked the resources page here in the sub and couldn't find anything related to pendulums, only the simple explanation on the FAQ, so I was hoping you could help me with it.

I accept anything from books and reliable websites to videos and even podcasts about it, and if the books are available in kindle format it would be easier for me to obtain them.