@WilliamImmThank you! I read a lot, but sometimes I just got overwhelmed with technical stuff I don't know, and just want to know what option to choose. But I love to know why also. :)
I will take some time reading that, but I don't know nothing about texture formats, so I don't know what to expect... mostly technical stuff about textures just sounds like gibberish to me...
@techangel85 yes I really know about that, just experimenting. I AM using it compressed, without problems other the ones I mentioned. :)
From what I know DDSopt only optimize textures, and not meshes (nif). And is safe to use, I optimized so much stuff, and beside rarely weird looking textures, no crashes.
I really just want to know better ways to optimize the different types of textures with the tool.
ps.: I used this as reference to start: https://wiki.step-project.com/Guide:DDSopt_%26_Texture_Overhauls/Mod_Optimization
ps.: Damn! I think i will have to read all that big topic ¬¬