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

Founded which 3d software should i learn for 3d printing models & stl files for printing
Emperor Dragons
clavenmoo
3D Printed Tree
RCLifeOn
WALL LED NANOLEAF
3DFactoryAlex
3D Printed Compass
Like_Lettuce
Jewelry box
Hcontriver
Speaker grill
Hcontriver
3D Emojis
muzz64
Tak Mahal
SelfCAD