Any program to create mods? Thread

Hello, I'll be clear, I need a program to create mods, that is, I'm not very good at programming, so they understand me better, I'm a mid-level developer, and when I saw that mods existed for Command and conquer generals zero hour , I thought "I'll try to see how" and then I facinating, however at the time of seeing how mods were made in that game, I realized that he was busy modifying too much to be able to create one, or at least that was what I saw, so my question is ... is there a program to create mods?

PD: if nobody understands me it's because I use the google translator, I do not speak English very well so I use it to communicate.