HOW TO MOD: What software?

[Ralph Curtis 3]

Question, if I wanted to mod, what software would I need in order to edit the SimCity files?
I do have photoShop and I have been a 3D artist since 1999 so this end is covered, need to know software files used to make the mods work in SimCity.
I am sure there is a learning curve and I am willing to do it, at least  for as long a this virus quarantine for the ENTIRE planet is in effect.
Any help would be a huge thanks...
R.C.

[sander12345 4]

https://www.simcityplanningguide.com/2014/01/mod-installation-guide.html

maybe this site wil help you with your need. 

[ScreamCon 15]

Depends what version of SimCity you plan to mod, for SimCity 2013, I use SimCityPak

Its finicky and can break, but find once its setup, can be a great interface for making notes on object types (graphical folders)