After the Metatag module has been successfully installed you can navigate to Configuration > Search and Metadata > Metatag
This configuration page let's you configure the metadata for different parts of your site, like the Front page, Global Content, Individual Content Types, etc.
Let's explore the configuration page and the sub-tabs in detail a little more:
- Metatag Defaults - configuring these allows you to set the default values for each content type or section of your site.
- Global - Using global as an example, when you set these defaults they will be used for every page/route in your site, if you don't configure a more specific metatag default then this one will be used.
Configure Global Default
By clicking the "Edit" button you can edit the Global default.
The Metatag module does an amazing job of describing each Metatag field, what it's used for and the type of information that you should provide. We won't go into all of the details but you should see the standard fields you are looking for, as well as the Open Graph and Twitter Card tags that are available after enabling the Open Graph and Twitter Cards metatag modules.
The Token module is a powerful module that let's you insert placeholders into fields that will then pull data from your content type when it's rendered on a page. The "Browse Available Tokens" link at the top of the page opens the Token Browser to make it easier for you to insert your tokens.
Here is a quick example of using a token:
Every page of your site needs a Title tag that will render in the users browser bar, all content types in Drupal by default have a "Title" field that could be used for this purpose. Using tokens you can enter A Step-by-Step Guide to Setting Up and Configuring the Metatag Module in Drupal in the field and when visitor views the page it will pull the title from that page and place it in the title tag.
You can do this for other fields on Content Types, add a Description field on your article and use a token to place that in the Description metatag on every page, no need to manually add it to every page. Drupal and the Metatag module with Token take care of that for you.