I use Auto Cad to design my 2d models. i learnt autocad from my civil engineering course and because im used to it, i did a 2d model of a box using autocad. .
For the 3D software that I used, I used Fusion 360 to design. I created stuff like a fidget spinner and even a pot. it is different from 2d as on top of sketching your design, you had to know how to extrude your design out.
I first sketched out the fidget spinner before extruding it.
For the pot,I had to sketch it vertically before extruding it. Is is much different then a fidget spinner