Sure, here you go. That'll get you started. We didn't adopt any of that or a specific solution/library/way, but they were good resources to think about the matter.

That's from our internal wiki, and "Plugin Architecture" was the first entry in that, just to tell you about how important it was.

Also, given that you describe yourself as a "junior developer", here's a reply to an Ask HN about "How to become a senior developer".

https://news.ycombinator.com/item?id=25025253

Plugin Architecture:

Dynamic Code Patterns: Extending Your Application with Plugins - Doug Hellmann

Link: https://www.youtube.com/watch?v=7K72DPDOhWo

Description: Doug Hellmann talks about Stevedore, a library that provides classes for implementing common patterns for using dynamically loaded extensions

PluginBase - Armin Ronacher:

Link: http://pluginbase.pocoo.org/

Description: Armin Ronacher is the creator of Flask, Jinja, and a bunch of other stuff.

Miscellaneous links on plugin systems:

https://developer.wordpress.org/plugins

https://techsini.com/5-best-wordpress-plugin-frameworks/

https://eli.thegreenplace.net/2012/08/07/fundamental-concept...

https://pyvideo.org/pycon-us-2013/dynamic-code-patterns-exte...

https://en.wikipedia.org/wiki/Hooking

http://chateau-logic.com/content/designing-plugin-architectu...

https://www.odoo.com/documentation/user/11.0/odoo_sh/getting...