Where can I download AutoCAD for free?
AutoCad provides a few options to try their products according to your needs:
1) AutoCad 360 which is a free (Android/iOS/Windows) App which you can use until you are more familiar with AutoCad, Which is by the way a great application to have on the go on Sites, and is also downloadable on normal PC machines.
2) A free trial of 30 days of AutoCad Lt which is a skimmed version of AutoCad having basically all features in the 2D dimension only.
3) A free trial of 30 days ofAutoCad 2017 which is the full version for AutoCad.
Sign up on Autodesk website and apply for free educational license. You will get further information on that site and then download frew from Autodesk.
Also you will get AutoCAD on torrent site like the piratebay, 1337x…. But prefer download form Autodesk site because you will also get other benefits like joining the design group ,etc.