Spent a few hours finding this out so I though I would pass it on. If you would like to have a home for your new creations as you are going through the Unity course you can use the free WebGL hosting service at https://itch.io/.
1.Create yourself an account
2. In your dashoard select 'Upload a new project’
3. Select HTML as game type and upload your .zip file you created from your Unity WebGL build (see the WebGL section on Block Breaker on the unity course)
You have a lot of options who see the game too so it looks really usefull for getting friends to help out with testing.
Hope its of use,
Cheers Paul.