Yeah, there were 2 golden ages:

1- When this internet thing came out

2- When this covid thing came out

On the first era, here's a Java lecture from Stanford, if it's too basic for you, it still has historical value, iirc it's something like Java 6. And it also reinforces the basics.

https://www.youtube.com/watch?v=KkMDCCdjyW8&list=PLA70DBE71B...

It's a bit harder to follow along with online materials since you have to use the Internet Archive, and download older compilers or use options to target older versions, but it's all the more fun for it.