✦ Oracle Java Documentation ➽ https://docs.oracle.com/en/java/javase/20/

✦ Codecademy ➽ https://www.codecademy.com/learn/learn-java

✦ Javatpoint ➽ https://www.javatpoint.com/

✦ GeeksforGeeks ➽ https://www.geeksforgeeks.org/java/

✦ Tutorialspoint ➽ https://www.tutorialspoint.com/java/index.htm

✦ W3schools ➽ https://www.w3schools.com/java/

✦ JetBrains Academy ➽ https://www.jetbrains.com/academy/

✦ SoloLearn ➽ https://www.sololearn.com/learn/courses/java-introduction

✦ CodeGym ➽ https://codegym.cc/