There are a number of books, programs and classes to date that offer "technical writing". Some of these are excellent; prepared by industry veterans who know what they are doing. But some people basically recycle old "business writing" concepts and techniques under the "technical writings".
"So what?" can ask, which is a fair question. And here's the answer: if you seriously consider going out and finding a job as a "technical writer," then at least one technical document should be prepared in accordance with industry standards and expectations. Business writing in general will of course help you communicate better and perform more effective business. That's why it's a good thing. But when you find a technical writing, business writing will not provide much help. The registrar does not accept the business writing as a proof of technical writing, especially in the hi-tech sector where I have been working for more than 10 years.
Business writing creates all kinds of copies, communicates and controls others in the work environment. This includes all office communications and topics such as how to write e-mail; how to make a report; how to write a discussion report; all types of business letters, etc.
Although useful, such knowledge is not enough to find work in a highly competitive field of modern technical communication. Instead, what you need to learn is the kind of documentation that is generated every day in such hi-tech industries: software, hardware, networks, telecommunications, manufacturing, chemicals, finance, defense, etc.
is a "scope" document, for example, and how was it written? How do you create and write "publishing notes"? What is the decisive difference between "surface treatment" and "procedural guidance"? Do you know how to write a QCP for a defense contractor?
There are many other similar topics the beginner must learn to prepare for a great career. After knowing the crucial difference between "business writing" and "technical writing", you can make a better decision on what questions you would like to ask before you buy technical articles or enroll in a technical writer. So you can not waste your time, money, and energy on a product or program that will not help you reach your main goal. As always, knowledge is power in this matter as well.