There are quite a few different software packages that can be used for 3D design with Fusion 360 being quite popular these days.
It was free and unrestricted until early in 2021 with some restrictions now in place for personal use.
This page has a good summary and is the kick off point as well
www.autodesk.com.au
Learning to use:
There is a raft of resources online and any google search will turn up videos that could keep you going for months.
However I have found two channels as starting points
On the second channel the beginners series is a great starting point
View: https://www.youtube.com/watch?v=A5bc9c3S12g&list=PL40d7srwyc_Ow4aaOGXlP2idPGwD7ruKg&index=1
I'll leave the sticky unlocked if people find other good learning resources.
Cheers
Phil
It was free and unrestricted until early in 2021 with some restrictions now in place for personal use.
This page has a good summary and is the kick off point as well
Fusion 360 | Get Prices & Buy Fusion 360 | Autodesk Australia
Fusion 360 is software for 3D CAD, modelling, manufacturing, industrial design, electronics & mechanical engineering. Subscribe or download for free.

Learning to use:
There is a raft of resources online and any google search will turn up videos that could keep you going for months.
However I have found two channels as starting points
On the second channel the beginners series is a great starting point
View: https://www.youtube.com/watch?v=A5bc9c3S12g&list=PL40d7srwyc_Ow4aaOGXlP2idPGwD7ruKg&index=1
I'll leave the sticky unlocked if people find other good learning resources.
Cheers
Phil