Hi Gizmo,
Glad to hear you've decided to learn Wwise.
That is unfortunate that you do not hear any sound. That said, the best way to figure out why you do not hear any sounds is in an upcoming lesson using the Profiler. With it, you should be able to see any error messages that prevent the audio from playing. You can proceed to that exercise without deleting the Soundbanks in the lesson if you want to figure out what the problem is with the current setup.
You could also try opening the lesson 2 Wwise Project and play any of the sounds (click on a sound, press space). If you hear it, then the problem most likely lies with Cube / SoundBanks (you should see the error in the Profiler). If you don't hear anything, then check your computer's sound settings and Audio > Authoring Audio Preferences in Wwise.
Let me know if this helps.