• Go to Extensions > Template Manager and click Templates on the left-hand side:

• You'll see a list of all the templates on your site:

• Click the Template Details and Files link:

• You'll now see an overview of your template files on the left-hand side:

• Click any file and you'll be able to edit it directly in the browser:

When you're inside the Template Manager, you'll see a toolbar like the one below:

• Click the "Copy Template" button and you'll be able to make a complete copy of your existing template.

Creating a copy like this could be very useful for testing purposes. It used to be much more difficult.

• Click the "Template Preview" button and you'll immediately see a frontend preview of your template with the module positions marked:

• Click the "Manager Folders" button and you'll be able to create new folders inside your template.

• Click the "New File" button and you'll be able to create a new file or upload one from your desktop.

• When you create a file, Joomla will offer you a variety of the most popular formats:

One of my favorite features of the new Template Manager is how easy it makes overrides.

Previously it was almost impossible to get a clear overview of what override possibilities were available on a Joomla site.

• Click the Create Overrides tab and the new Template Manager presents all of the possibilities in one neat list:

• Click on a component and you'll get all the possibilities inside that one component. In this example, I clicked on com_content:

• Click on one of the possibilities, for example, article, and you'll see this message:

• Go back to the Editor screen and your override files will be available for editing: