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2. Learn Servlets

Java servlets are Java classes that are designed to respond to HTTP requests in the context of a Web application.
By learning Servlet, you will be able to understand how to process the HTTP request, how to return HTTP response, how to build a web page, etc.

3. Learn JPA

The Java Persistence API (JPA) is the Java standard for mapping Java objects to a relational database. Mapping Java objects to database tables and vice versa is called Object-relational mapping (ORM).
By learning JPA, you will be able to map Java class into the database table directly (using ORM).

4. Learn Design Patterns

In software engineering, a design pattern is a general repeatable solution to a commonly occurring problem in software design. A design pattern isn't a finished design that can be transformed directly into code. It is a description or template for how to solve a problem that can be used in many different situations.
By learning Design patterns, you will be able to apply commonly used design patterns in real-time project development to solve a particular problem.