In this tutorial, we will explore the Template Manager in Joomla. Templates are what Joomla uses to control how your site looks
You can download and install templates, modify existing ones, or even make your own. That's all beyond the scope of this tutorial, however
1) Go to Extensions...
 
2) ...then Template Manager
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This is the Template Manager. As you can see, all the installed templates are displayed here. The default template is marked with a star, as seen here

3) Hover over the title of a template to see a preview of it

4) Click on the template's title to view more details and options
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Here, you'll see a description of the template, along with any parameters that have been coded into it. The parameters will probably be different, depending on which template you're viewing

5) Click Edit HTML
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This page allows you to edit the template's HTML. Changes made here affect every page of your Joomla site
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6) Make any changes you want, then click Save
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Next, let's edit the CSS

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CSS is used by modern websites to control the colors and layout of a page
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There are several files here. Some templates, such as this one, allow you to change the overall color scheme without changing everything else; that's done using the separate CSS files seen here

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The bulk of the code for most templates, however, will be in template.css
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Scroll down
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7) Click the button next to template.css
 
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Scroll back up
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8) Click Edit
 
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Just as before, Joomla provides you with a text editor with which you can change the contents of this file

9) Click Save
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10) Once you're done with this template, click Save to go back to the Template Manager
 
11) To change the default template, click the radio button next to the template you want to be the default

12) Click Default
 
Notice, the star has moved next to the new default template

In addition to the Site templates, which are used for the public frontend of Joomla, there are also Administrator templates
13) Click the Administrator tab to view them

Everything here works the same way as shown before with the Site templates
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This is the end of the tutorial. You now know how to manage templates using the Joomla Template Manager