For WordPress development , especially plugins , we need to use a source control system. Here at Roventix we use RiouxSVN. It is free for the initial development, so that's great for developers looking for a cheaper option. Try it out and let us know your thoughts.
Drupal Core release 8.6.12 has been announced on 14 Mar 2019. It is recommended that websites be updated immediately. There is also a release of 8.5.13 for websites still running 8.5.x version. If your website is behind in terms of any critical security release, please carefully analyze and update without any delay.
If you need any help in upgrading any Drupal website, please reach out to us.