There are many different categories of operators.
The operators in those different categories have different purposes.
This lesson will not attempt to teach you about, or even to introduce you to all of the different operators.
Rather, this lesson will teach you about arithmetic operators and equality operators.
Future lessons will teach you about relational operators and logical operators.
You will learn about many other operators in due time if you continue to pursue an education in computer programming using Java, C++, or C#.