I will second the idea of Fusion360.
I went to school to be a drafter and have had access to AutoCAD since I graduated in '91 and even though I am now a (poor) software developer I am always sketching things. I have plenty of projects I have done in 2D using work software, but I want to potentially sell some stuff and needed to not use company software for legal reasons. So I went looking for something as well.
I was already using Fusion360 to loft my 2D layouts so I could 3D print them for mockup. But I decided I needed to jump in and see if I could make it work. Not going to lie, the first layout I did was an absolute pain, but I have learned some and the second one I did was so much better.
I just finished this project and hit the "buy it now" button yesterday. The first sketch I ever did was the top crossmember, while the second was the lower crossmember.
And Fusion is free even if are selling parts, provided you are under some gross sales number. You don't have access to strength test it and you have to stay at 10 projects or less, but you can archive projects so it's not like you are stuck at 10 only. It does work offline once it is running, but I haven't played with that any so no idea if there are other limitations. And the models can be archived locally so they aren't stuck in the cloud only.
I much prefer a software that isn't subscription based. I would love to find an earlier copy of AutoCAD like version 11 or something. Which makes Librecad a good option as mentioned above.
In this case, Fusion360 was free so I decided to see if I could make it work. In the end, pretty happy with it.
I need to do some things different to maybe make it more stable and need to get into the sheetmetal side of things. Found out after I got done that SendCutSend has settings you can download to match their machines which might have pushed me to figure out sheetmetal modeling for this project instead of next time. Might have saved me from making the mount too narrow and having to revise it after I submitted them for manufacturing.