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

Founded which 3d software should i learn for 3d printing models & stl files for printing
3D Vampire Skull Voronoi Mesh
SoutheastTexas3DP
3D printed Bike rollers
andrewsharmon
Fidget Spinner
ardystalgysr
Small Pinball Machine
Jeremy Williams
Printable Print Settings
Alexander Þór
Thwakahawk
Flashhawk