Restarting apache on Centos
Block all search engines from crawling your site using robots.txt
Copying files between docker containers
Connecting to your docker based mysql instance.
Link to a free stock photo site I often use
Drupal entity validation and constraints, a good example
Some key docker commands used most often
Example problem: Configuration bootstrap_sass_starterkit.settings depends on the bootstrap_sass_starterkit extension that will not be installed after import.
Solution: delete the bootstrap_sass_starterkit.settings.yml file from the config/sync directory
and if that doesn't work just delete the files from the config directory.