As you probably know by now, we're constantly upgrading the content of the courses and adding new material to the existing curriculum.
These are just the new lessons, I'll let you know about the new courses soon.

Here are just a few of these, published recently:

In Learn SOLID Principles:
  • SOLID Synergy and Pragmatism
  • The Open/Closed Principle (OCP)
  • The Interface Segregation Principle (ISP)
  • The Liskov Substitution Principle (LSP)
  • The Single Responsibility Principle (SRP)
  • SRP in Practice
  • The Dependency Inversion Principle (DIP)
  • ISP in Practice

In Learn Maven:
  • Importing a Project into the IDE

In Learn Java Streams and Lambdas:
  • Parallel Streams

In Learn What’s New in Java:
  • Stream API Additions
  • Sealed Classes
  • Custom Serialization and Deserialization
  • Other Key Additions
  • Switch Expressions
  • Compact Source Files and Instance Main Methods

In Learn Java Basics:
  • Date and Time
  • Enums
  • Basics of Working with Files
  • Generics

In Learn Java Logging:
  • Logback Configuration

Of course, each course has a Changelog - which is more complete, to see exactly what new material you have access to.

Hope this quick heads-up helps.
Cheers,
Eugen

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P.S. Also making solid progress through the Roadmap :)