back in the day, there was an application called KeyCaps that would allow you to see what fancy characters could be created by holding down the option key or the Apple key.
It kinda faded away, but like old sailors, it didn't die, it just got posted to another place.
You can do all of this with a mouse.
Go to the system preferences and select International.
Select the Input Menu.
Put a check mark in the Keyboard Viewer box and also in the "Show input menu in menu bar" box
Close out of System Preferences.
Now go to the menu bar, to the little flag thingy (input menu) click and choose, Show Keyboard Viewer clicking on the on-screen keyboard, with the mouse, will solve your problem.
Impressed? Yeah, me too!