Hello and Welcome
Thank you for the kind words with regards to the course.
It sounds as though you are actually doing everything right but there are a few things to check.
It might be a cache issue. Clear cache by going to Site >>Maintenance >> Clear Cache; also clear the browser cache a few times.
Under Global Configuration >> System it is a good idea to turn caching to Off while constructing the site.
In the Editor click the toggle button and check that the code is exactly the same as pasted. When you copy and paste into the editor you can also be pasting a lot of unwanted hidden text. I know that it is tempting with a "table" but in general it is better to paste as plain text then format afterwards.
Use firebug to check that the code in the actual site is the same as the editor
www.ostraining.com/blog/joomla/using-fir...it-joomla-templates/ Can you check your site in different browsers to see if it behaves the same in all.
Wamp can work really well but sometimes it does not behave in the same fashion as a proper hosting account.