To be able to know how to start with technical writing, it is important at the beginning to know what technical writing is and its usefulness to the field of Computers. Your Dictionary defines technical writing as a form of writing about a specific subject which in turn needs direction, instruction or explanation. It is not only clear but also an efficient way of explaining something with information on it works. This writing takes many forms including but also not limited to tangible or even abstract.
Tangible writing involves writing about things that can be seen, heard, felt with the hands like computers/technology, software programs and maybe information like how to assemble a baby cot, create various meals etc. The idea behind it is writing about things that engage the human senses. Abstract, by contrast, could involve a series of writings that do not involve tangible items/objects. Types of technical writing include reports, memos, user manuals/guides, proposals, press releases, texts on the user interface, and product descriptions just to name a few.

Noting that this writing needs to be clear, precise and unto the point, the writer can begin by putting some essential skills into practice. There needs to be quality research done, in this case on the subject of computers. The research will contribute to the content of the document being written. Having technical knowledge on the subject; for example, computers and technology. Evidently, computer experts need to be able to put their expertise on paper as they are people with knowledge.
Knowing the kind of audience that is being reached with the writing is equally important; know who they are, what kind of content they are trying to access and how to make it accessible to them in an understandable way. Technical writing gives the ability to write complex computer jargon in a simple manner like breaking down configuration, coding, pitching proposals, justifying the selection of codes etc. Being a competent technical writer can pave the way for a much-needed promotion as an IT professional. A well-written technical piece on achievements and why promotion is deserved speaks volumes to employers otherwise not able to have in-person meetings with all employees.

Technical writing as a skill promotes the marketing of computers and other complex tech gadgets that would not be easily understood by people who are not IT professionals. This is done through creating simple to read manuals, simple to read brochures, pamphlets. As an Information Technology pro, technical writing makes you possess good public presentation skills. The simple act of writing things down in an organized manner contributes to clear thoughts that definitely come in handy when making presentations.
The ability to write cushions you during customer interaction. Having good documentation of issues protects against issues that could come up later. When they do, it is easy to produce clear backup documentation. Getting ahead in the field of computers and technology, therefore, requires IT professionals to continue embracing diversification of talents. A well-rounded IT professional needs to possess the skill of technical writing.