Mechanical Drawing Software

I'm in the drafting and training in college and I'm looking for software that I'm having trouble finding.

I'm looking for one that is easy to use and easy to understand

Does anyone know the best position to download?

If you mean a program AutoCAD, Inventor, I would recommend. We have used this program at my school and it is very easy to use.

Have you tried Auto CAD? is commonly used, but I can not say it is the best ..