Just mentioning the PCNSE prep YouTube series is in the process of being refreshed. New content includes PAN-OS 10.x as well as new product lines, marketing nomenclature, etc.
All stuff covered on the latest exam (and more...) for those of us who need to re-certify.
https://www.youtube.com/channel/UCmLLiVYaHYie29AT-hb48lA
I found it to be a good series for getting up to speed on 10.x since we just recently upgraded to it, and essentially skipped 9.1 altogether.