Download java jdk in Azul JDKs and follow this steps to Install Java JDK 17 on Windows.
Access Codewars to view all katas.
Install IntelliJ IDE or other that you like and create a java project.
Choice your JUnit version, copy maven dependency and add to pom.xml file.
<!-- https://mvnrepository.com/artifact/org.junit.jupiter/junit-jupiter-api -->
<dependency>
<groupId>org.junit.jupiter</groupId>
<artifactId>junit-jupiter-api</artifactId>
<version>5.9.2</version>
<scope>test</scope>
</dependency>