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

Founded which 3d software should i learn for 3d printing models & stl files for printing
thread riddle
alphastratus
chateau reine des neiges
Stitchroadkiller
Nurgle champion
PollyGrimm
Catapult
Atime
Dragonslayer Berserk
xavierm2010
hair clip
libowsky
Airsoft suppressor
Sargedawg
Jetsons Car
Gorilla_Grodd