For private use, I prefer to use Open Source software. It is software that is free to use, and they are usually developed and maintained on an non-profit voluntary basis.
LibreCad
If you are used to vector-based documents, such as from the industry standard program Autocad, then LibreCad has the corresponding basic features.
Information and Help:
https://librecad.org/
http://forum.librecad.org
http://wiki.librecad.org
Can be retrieved e.g. here
https://sourceforge.net/projects/librecad/