You need composer to run some Drupal 8 modules. For some people this is scary... Ik have hundreds of students who chose a CMS in order not to use code... Now this seems far away.

Disable Modules

This module allows you to disable modules just lik in Drupal 7. In Drupal 8 this is no longer possible. You have to uninstall the module so that it can not leave anything behind in the database.

Uninstall modules

You can add modules to your Drupal 8 site if the update module is active... Modules you don't want to use any more can not be set unactive, like in Drupal 7. The reason is that unactive modules can leave something behind in the database. You have to uninstall them.