Technical writing is quite similar to the general form of writing. The only exception is that for technical writing is that one must probably have to be into the field they want to write about; otherwise one would just need to make enough research about the topic you want to write about.
Technical writing gives deep insight into whatever the subject matter happens to be. There are different examples of technical write ups such as laboratory reports, how to use guides etc.
The essence of technical write ups are to make a user acquainted with the field they need information on. To get started with technical writing, one first of all has to make a lot of research. Research could be in the form of reading books, checking newspapers, using the internet, Web of science and any other reliable source.
After getting your appropriate research done, you can begin to put forth a draft which should be written in a sequential order. Your write up should be a step by step guide and should have a correction phrase which enables the user to know that they are on the right track. When done with your draft, edit your write up, proofread it and check for errors.