What Is Code? by Paul Ford.
A truly stunning exposition on programming and computers. Written for business users it is a model of exposition for business readers. Some 38,000 words so it isn’t superficial but insightful.
I suggest you bookmark it and read it on a regular basis. It won’t improve your computer skills but it may improve your communication skills.
If you want to know more background on the piece, see: What Is Code?: A Q&A With Writer and Programmer Paul Ford by Ashley Feinberg
If you want to follow on Twitter: Paul Ford.