Provide definitions for terms (I like to consult with Merriam-Webster) and full forms of abbreviations
If you write series of documents consider creating a reference page with all definitions
I like to draw pictures (or ASCII art) to accomplish documentation
If the picture represents in-precise information I like to use XKCD-style, so reader would treat it as a schematic explanation "on the back of the napkin"
Provide structure (use headers, headers of different wright)
Limit the size of the sentence and the size of the paragraph
There are a lot of useful style guides (which I need to start to follow):
My tips:
These are great resources and tips! Thanks for your input!