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Hello, I am thinking make a mod for HOI4 and EU4 but what I need to learn for this ? I have little experince from Blender3d and Java.Do I need to learn C,C++ or something like that ?
No C++ until you are hired as a coder.
Look here for HoI4: https://hoi4.paradoxwikis.com/Modding
For my HoI3 modding I used only notepad++ and PAINT.NEt for gfx.