I am a big fan of OnShape, its free for personal use. By that they mean that all your projects are publicly accessible when using the free options. Otherwise its the same as the paid option. As a hobbiest this is fine with me because I am putting all my stuff up with a creative commons license anyway. It is my way of giving back to a community that has given me so many designs for free.

Teaching tech did a great introductory series on it which includes a video about why he chose on shape.

https://youtube.com/playlist?list=PLGqRUdq5ULsONnjEEPeBxxStEsobDKAtV

If you have experience with other cad programs you'll probably get through the videos quickly as the concepts translate from software to software, its just a difference in interface and execution.