How do I enable a REST resource for a custom content type?
sorry my english is not very good

If you want to access these types of content separately, you must do the following:
1) download the module restui: https://www.drupal.org/project/restui/releases/8.x-1.x-dev

2) Go to Extend, activate modules, HAL, HTTP Basic Authentication, RESTful Web Services,
Serialization, REST UI.

3) go to the path: / admin / config / services / rest

4) Edit the RESOURCE NAME Content, and mark all the checkboxes.

5) you should perform a test in the browser with the following path: drupal8 / node / 1? _format = json

note: if the information is displayed, it means that the rest server is set correctly.

6) Create a view and select the type of content you want to display and in the "REST EXPORT SETTINGS" section mark the "Provide a REST export" checkbox and in "REST export path" type "car_makes".

This way if you go to the route: "/ drupal8 / en / car_makes" you will see that it will show the information in json format.