As an administrator, you will run into situations where you will have to delete certain users. The process is simple and starts in the "Organization" tab of your account settings.
One important aspect to keep in mind when deleting a user is that all resources (datasets, dashboards, connections, integrations, API tokens ...) are automatically transferred to you or the person deleting the user.

After the user was deleted, when accessing the dashboards and datasets that the deleted user was an owner of, there will be a tag added to the dashboards and datasets containing the email address of the deleted user.

You can then perform a search in the UI using the email address of the deleted user in order to easily retrieve all the dashboards and datasets that were previously owned by them.
