What should be the Advanced Java?

Question

What is next step after learning JavaFX, OOP, Data structures and linking the application with a database? I want some advancement in Java

Answer 1

Get familiar with some of the most popular Java frameworks like Spring, Hibernate, GWT, Grails. There are a lot of these lists with pros and cons, like:
https://javapipe.com/blog/best-java-web-frameworks/
There are also additional dev tools and programs that can speed up java development and testing, like Maven, Gradle, JUnit.
See some more listed here:
https://www.guru99.com/java-tools.html

Answer 2

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