Is Amazon Seller University still their best training aid here in the ’22-’23 YR time frame?

Hopefully that’s a simple question as I have been studying some things through time. I am looking for that strong source of true Amazon information. The only phrases I know are Amazon Seller Central and then Amazon Seller University. Are those still real and worthwhile?

I am not looking for a paid course thing so spammers and promoters please do not respond to my pos t.

I have been studying some accounting things and some product things. Now I’m looking for that solemn Amazon based platform to study on. Do I just have to sign up to a seller account and start hunting? Do I have to sign up to learn it. Could I switch my e-mail/account name after I would sign up?

Thanks for any tips.