There are many useful features introduces from Java 8 to Java 13 like lambda expressions, Stream API, New Date, and Time API, Creating Immutable Lists, var for storing local variables without types, String in switch case, Text Block and many more.

Staying up to speed with Java is difficult for any Java developer, as a new version of Java is released only six months but If you want to learn those new features and looking for some resources then the following courses will help you.

To summarize releases over the last two years since implementing the predictable six-month release cadence:

Java 10 (Mar 2018): 12 features
Java 11 (Sept 2018): 17 features
Java 12 (Mar 2019): 8 features
Java 13 (Sept 2019): 5 features
Java 14 (Mar 2020): 16 features which are coming on March 2020

Btw, If you are a beginner and learning Java in 2020, I suggest you join the Java Programming MasterClass course by Tim Buchalaka on Udemy, one of the best courses to learn Java in depth.

Anyway without wasting any more of your time, here are some of the short
courses to learn new features of Java from JDK 8 to JDK 13.

1. What’s New in Java 8 By José Paumard

This course covers the most useful parts of Java 8. This update of the Java
platform is the biggest of all. It’s even bigger than Java 5 that saw
the introduction of generics. We’ll begin with lambda expressions and
the Stream API, which bring new fundamental patterns to the Java
platform.

Many problems solved with the Iterator pattern are now solved much more efficiently with the patterns brought by the Stream API.

But Java 8 is not only about lambdas, streams, and collectors, there is also a new Java Date and Time API which are covered in this course.

here is the link to join the course - What's New in Java 8

2. What’s New in Java 9 By Sander Mak

Java 9 is packed with new features. In this course, What’s New in Java 9,
you’ll get an overview of the most important changes to the language
and libraries. First, you’ll delve into the module system, introducing
modules into the Java language.

Then, you’ll discover jshell, a new tool for interactively experimenting with Java code. Finally, you’ll explore smaller and incremental changes, such as improvements to APIs like Stream and Optional, the addition of collection factory methods, and newly introduced APIs such as ProcessHandle and HttpClient.

When you’re finished with this course, you’ll be ready to make the most of Java 9 in your own projects.

here is the link to join the course - What’s New in Java 9,

3. What’s New in Java 10: Local-variable Type Inference

Java 10 is released only six months after Java 9. In this course, What’s New in Java 10: Local-variable Type Inference, you’ll learn about the accelerated release schedule of Java and what it means for you.

First, you’ll learn about the turning point in the release schedule and the
new features that are in store. Next, you’ll dive into the most
eye-catching feature in Java 10: the introduction of local-variable type
inference.

Finally, you’ll uncover other new features such as performance improvements to the G1 Garbage Collector, the introduction of Application Class Data Sharing, and improved Docker awareness of JDK 10.

When you’re finished with this course, you’ll be ready to make the most of Java 10 in your own projects.

here is the link to join the course - What’s New in Java 10: Local-variable Type Inference

4. What’s New in Java 11 By Sander Mak

In this course, What’s New in Java 11: Long-term Support, you’ll learn about the new and most important features in Java 11.

First, you’ll learn about the accelerated release schedule and how Java 11 is
different. Next, you’ll dive into the many deprecations and removals
that happened in Java 11 that may affect your codebases.

There are new library and language features to explore as well, such as an all-new HttpClient API.

Last, you’ll learn about performance and security enhancements in this
release. When you’re finished with this course, you’ll be ready to make
the most of Java 11 in your own projects.

here is the link to join the course - What’s New in Java 11: Long-term Support

5. What’s New in Java 12 By Sander Mak

Keeping up with Java can be a challenging task. Only 6 months after the release of Java 11, comes Java 12.

In this course, What’s New in Java 12, you get an overview of all the important new features in Java 12. First, you will learn about API changes, such as the CompactNumberFormat API and new methods on the String class.

Next, you will discover a preview Java language feature called Switch
Expressions. Finally, you will explore how to use JMH, a
micro-benchmarking tool for Java code that is heavily used in JDK 12
itself.

When you’re finished with this course, you’ll be ready to make
the most of Java 12 in your own projects.

here is the link to join the course - What’s New in Java 12

6. What’s New in Java 13 By Sander Mak

Java 13 was the second release of Java in 2019, yes just after six months of Java 12 release.

In this course, What’s New in Java 13, you’ll get an overview of all the important features in Java 13. First, you will learn about API changes, such as updates to the ByteBuffer API.

Next, you will discover a preview Java language feature called Text Blocks.
Finally, you will look at platform changes, looking at how the JDK
reimplements the Socket API and improves upon the Application Class Data Sharing feature.

When you’re finished with this course, you will be ready to make the most of Java 13 in your own projects.

You can see that all these courses are from Pluralsight and you can access them with just one membership, you don’t need to buy individual courses. Btw, if you don’t have a Pluralsight membership then this is probably the best time to get one to give your learning a boost.

here is the link to join the course - What’s New in Java 13

Is there a course which covers all new Java features?

For those, who prefer to buy courses than memberships, there is still one
course I can suggest which comprises all JDK changes from Java 8 to Java
12, it’s Java New Features (Java 12, Java 11, Java 10, Java9 & Java8) course on Udemy.

It doesn’t cover Java 13 but still a great collection to learn other
features. You can buy it on under $10 in several of Udemy flash sales
which happen every month.

here is the link to join the course - Java New Features (Java 12, Java 11, Java 10, Java9 & Java8)

That’s all about some of the best courses to keep yourself up-to-date with new Java features introduced from JDK 8 to JDK 13.
These courses are small and to-the-point which means you can complete
them in a quick time and learn only meaningful and essential features
instead of learning everything.

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P. S. — If you are a beginner and learning Java in 2020, I suggest you join the Java Programming MasterClass course by Tim Buchalak on Udemy, one of the best courses to learn Java in depth.