Add CSS for Print

Method 1 : Add a specific styling sheet for Print.

On your theme (THEME.info.yml for D8 and THEME.info for D7), Add css file as [print].
Example
stylesheets[print][] = css/print.css

Hook Update Deploy Tools is a great contrib module help to make most of site deploy operations programmatically.
Link : https://www.drupal.org/project/hook_update_deploy_tools

Get entity types list :

$itmes_list= \Drupal::entityTypeManager()->getDefinitions();

Get Entity type (Content / Config)

$itmes_list['node']->getGroup();
$itmes_list['node_type']->getGroup();

Composer can hadle CVS (git, svn ...) and ZIP packages.
To install/Update your custom modules, add a custom repository to the composer.json file, following this example.

1. Add package repositories
Here, youtubeapi and sadb