which 3d software should i learn for 3d printing —

Founded which 3d software should i learn for 3d printing models & stl files for printing
Pokeball
metalnat
Nozzle Ring
MichaelDesign
Tensegrity Table
JUST3D_PRNTNG
MMF 2018
WWWdotPDXDDDdotCOM
OMSI MMF 2018
WWWdotPDXDDDdotCOM
MMF 2018
WWWdotPDXDDDdotCOM
ProtoPasta Spool MK1
Jacob Does Stuff