NetBeans has contextual menus all over the IDE that you can invoke by right-clicking. This saves you from having to look for the appropriate command in the main menus. Here are just a few examples:

Right-click on a node in the Explorer to get a list of all commands available for that object.

Right-click in the Main Window for a list of toolbars to display.

Right-click on the Workspace tabs in the Main Window to configure Workspaces.

Right-click on the Watches node in the Debugger Window to add a watch.