For a good CAD user book i find the one for QCAD very good for learning the basics of CAD drawing (and the Qcad software).
This book is not free (35$), but it's available in multiple languages (english, french, german, italian). Even if you use another CAD software, its a good starting point.
This book is not free (35$), but it's available in multiple languages (english, french, german, italian). Even if you use another CAD software, its a good starting point.
https://qcad.org/en/documentation/the-qcad-book