Really depends on how motivated and how much time you want to invest.
I find Tinkercad to be an incredibly simple (and yet also surprisingly useful) way to build our simple to moderately complex parts, it’s free, and you can even sell parts you’ve created with it. It’s no Fusion360, but it also doesn’t have nearly the learning curve.
Fusion is fantastic for complex parts, but costly if you ever want to sell anything. It is a combination CAD/parametric modeling program. FreeCAD has gotten better over the years, though it’s a bit clunky but has a lot of parity where it counts for 3d printing. Either one is going to require a time investment. Others have provided good resources for that.
Personally, I’d start with Tinkercad to dip your toes in the water. Let your needs decide whether you should invest more time in another program (or not). You might be surprised at how for it can take you, and it will introduce you to the thought process you’ll need for designing 3d objects.
I find Tinkercad to be an incredibly simple (and yet also surprisingly useful) way to build our simple to moderately complex parts, it’s free, and you can even sell parts you’ve created with it. It’s no Fusion360, but it also doesn’t have nearly the learning curve.
Fusion is fantastic for complex parts, but costly if you ever want to sell anything. It is a combination CAD/parametric modeling program. FreeCAD has gotten better over the years, though it’s a bit clunky but has a lot of parity where it counts for 3d printing. Either one is going to require a time investment. Others have provided good resources for that.
Personally, I’d start with Tinkercad to dip your toes in the water. Let your needs decide whether you should invest more time in another program (or not). You might be surprised at how for it can take you, and it will introduce you to the thought process you’ll need for designing 3d objects.