This hook is used most often.
At first you should add your library via custom module or theme1. Create custom_module.libraries.yml file in your module folder
2. Put js or css in your module folder
3. Edit custom_module.libraries.yml file and add name of the library and path to your css or js
You can deny or allow access for some users based on user id or user role or another conditions via custom module
You can modify view before rendering
Open your Cpanel and do search by "cron" keyword:
Enable debug mode via settings.php
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