Inkscape is a vector art program, it is fundamentally different to any raster art program. Like just download it and try to make just about anything with it, if you never used a vector art program, you’ll be absolutely lost. If you know GIMP, Krita or Photoshop you at least have a basic understanding of the others.
I’ve played around with all four programs. I guess it just comes down to what you’re using the tool for. I can’t draw so I have no business in Krita. I’ve made logos in Inkscape and have used GIMP and Photoshop for different things. I’ll start most projects GIMP and move to a more specialized tool of I need it.