None of these things has anything to do with agile, they are all from scrum. Scrum is not agile as it is the very definition of prioritizing processes and tools over individuals and interactions. If you want to learn about scrum, you have asked the right questions, but if you want to learn about agile development read the agile software manifesto and run away screaming from scrum.
[1] https://agilemanifesto.org/