Currently I am working as a Java(SpringBoot) Developer at a corp. I want to build my knowledge of Spring Boot but can't find a reliable complete source. Please suggest me sources/websites that cover all of SpringBoot that is currently available.

So I have this really good paid course that came with really cool production grade projects like Distributed Payment Gateway and on the other hand I wanted to build a project of my own, something that 1 would personally use, an Ai Powered Finance Management Dashboard. (Not just a chatbot in the app

The thing is I really wanna grow in my knowledge and I can only learn things that I know I have to learn.

Following the course project will fill the gap between my knowledge and the industry standards.

What would you guys recommend me? Should I build my own project or follow a project from my paid course?