### 6.1 Theme regions
Drupal's theme layer allows themes to implement any number of custom regions and
-omit ones referenced by the default core theme Garland. A feature should one of
-the following regions for blocks critical to its functionality and can expect a
-compliant theme to support them.
+omit ones referenced by the default core theme Garland. A feature should use one
+of the following regions for blocks critical to its functionality and can expect
+a compliant theme to support them.
- `content`: The main page content region.
- `left`: The lefthand sidebar.