Learn AutoCAD for free using this step-by-step AutoCAD tutorial series containing nearly 40 videos with lesson files https://sourcecad.com/courses/autocad-essentials-course/

In this video, I will essentially tell you about converting a PDF into a DWG file. Using this method you can convert scanned PDF files into AutoCAD drawing files easily with just a couple of tweaks.

You can also use the tips explained in the video to insert image files as an external reference in AutoCAD.