Petalinux complete tutorial suggestions?

Do you know any tutorial or sources that i can learn how to work with Petalinux? I want to learn what is rootfs and kernel used for, what is dtb, what does the generated files after building mean, how to write a driver for an IP etc. AMD’s documentations are not very clear and they contain a lot of mistakes at the example parts.

Do you have any suggestions. It does not have to be a complete tutorial or a document. You can suggest multiple sources.

Thank you!