Get to know your audience
Analyzing your audience and readers is the most important thing. You have to make sure that the readers are comfortable reading the material you have written for them. In order to understand how the audience responds or reacts to your writing, have the material read by people you know. This will help you understand how the audience reacts. If the language is too hard to comprehend, tone it down to make it less scary. If you are working in a particular industry, try to analyze the general aptitude of your audience, age group, nationality, mood, interest, etc.
Use simple structure
Do not write complex structure when you are writing on a technical subject. Complex structure kills your readership as nobody likes to read things that go straight over their head. Use simple language structure to make the material easy to understand.
Do not use too many jargons
Jargons are necessary when you are writing on a technical subject, but using too many of them in your piece/writing material often turns off readers. The situation gets even more troubling when your audience consists of people from different fields. Jargons make the language harder to understand as general readers spend most of their time understanding the meaning of new words.
Avoid long sentences
Long sentences are bad and hard to understand if the writer is a newbie. In technical writing, long sentences kill the purpose of writing and confuses the readers. So keep it short and precise. Write to the point sentences consisting of 15 to 20 words maximum.
Use correct grammar
Use correct grammar and avoid typos. Proofread the material after you have written it as you may find flaws and mistakes that might have escaped your notice while writing.