Which concepts in Java are the most important to know while learning Selenium?

If you are a manual tester, who wants to learn Selenium (and Java) and does not know anything about programming,

these are your FIRST 100 THINGS TO LEARN.

Please consider what follows a checklist aimed at guiding your learning, nothing more.

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JAVA

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1. install Java JDK
2. install Eclipse
3. create a simple standalone project in Eclipse that displays HELLO WORLD!

public class TestClass {
 public static void main(String[] args) {
  System.out.println("HELLO WORLD!");
 }
}

4. learn more about Eclipse: views, perspectives, debugging code

5. create variables with int, String, char, boolean, double types

int number;
double price;
boolean isValid;
char character;
String text;

6. assign values to variables

number = 10;
price = 45.22;
isValid = false;
character = 'a';
text = "this is a sample text";