We have our own Wordpress plugin for our site. Someone developed it for us some time ago. I am generally aware of how it works and am able to code PHP, JS, etc. and have made some mods on the plugin over the years.
I am wanting to know what the steps are to updating the plugin and making sure it is ready for the newest version of Wordpress as it hasn't been updated in about 2 years.
Is there a flowchart of steps needed to walk through to make sure a plugin is as it should be?