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

Founded which 3d software should i learn for 3d printing models & stl files for printing
Wearable Technology
brandonh429
Air Rocket
thoward
Blooming Trophy
3Designer
Tensegrity Trophy
3Designer
Star Grid Trophy
3Designer
Beauty lies within
akshaymate
Weed Plant Light
jackvandergriff