Operators are an important part of the PowerShell language. Try this to learn more about them:
This will list all the different kinds of operators. For example, you will need comparison operators if you want to create conditions. You can change your line and be a bit more specific if you want to learn all about them:
As you can see, PowerShell provides not just Help for individual cmdlets, but also for general topics, such as operators. You will not need to enter the complete Help topic name. As long as what you enter is specific enough, Help will output the Help information.