I Really Want To Create A Mod Like The Galacticgames mods,you know that the news will announce
that a company will release this and that…and you will get to create your own console!!!
bottom line:
how to make a console mod
I suggest you use Ultimate Mod Maker! (Only on Windows)
I have a mod maker under development, but its bugged out 
(Java, cross platform)
Lemme get you into this: There are 2 ways to make mods, the easy and the hard way.
The Easy Way
Use the UltimateModEditor, found here. The UltimateModEditor can make mods just by clicking on a button. As @Stain said.
Pros:
-Easy way of making mods
-No coding experience required
-You make topics, platforms, events, researches, lab researches and even achievements
Cons:
-There’s a limit, you can’t make anything.
-You can’t make advanced stuff, you will need knowledge for that.
-Your mod will require UltimateLib
The hard way
Using the gdt-modAPI, you can make anything from scratch using Javascript. As @Haxor said, it can be found here: https://github.com/greenheartgames/gdt-modAPI/wiki
Pros:
-Unlimited possibilities of doing anything.
-Won’t require UltimateLib
-Your way you can sort the code
Cons:
-You need basic JavaScript experience: (check here to start learning: www.codecademy.com )
-You can’t make Lab Researches or Achievements, since the api doesn’t support it yet.
-Takes a bit of time to learn what is needed.
Conclusion
Hope I helped. Though, I suggest you use UME first, make a basic mod, and after a few weeks, rework the mod in the api. this way, you’ll have more freedom.
Please stop stating using the GDT Mod Api is the “hard way”. You demotivate people! 
You just do it to sound professional.
¨@JhayDogg24 Dont be afraid to use the Mod API, I’ll give you a tutorial on a PM if you want 
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