How to make Title Filed Required I have migrated my Drupal 7 website to Drupal 8. The content types are showing title as optional and when we save a node without adding the title it's giving the fatal error. 

How can we make the title field compulsory?

Note: I know title field is required by default, and it is required by default in my Drupal 7 site. But after migrating the site to Drupal 8 it's not showing required. Is it possible if export content types configuration from my new site and edit the configuration and import them again to fix this issue?
You can indeed edit the exported config and then re-import it to make the title field mandatory.

Always be careful when editing config directly.

The config files generally follow the naming convention core.base_field_override.&lt;entity_type&gt;.&lt;bundle&gt;.title.yml.

There should be a required key which is set to false. Simply change false to true, save and then re-import your config.