Try to use as few capital letters as possible. Of course use them for the first letter of a title or a heading, but not in the rest of the heading, unless it includes a proper name, like the name of a customer, location or system, or an abbreviation.
Encasing individual words or phrases with quotes in no way enhances the reader's understanding of what you’re trying to say. They are distracting. Don’t use them, unless you're directly quoting someone. If you want to emphasise a word or phrase, embolden, italicise it, or do both.
Use hyphens to indicate that you want two or more words to be read together as a single word, such as back-up. Also hyphenate to avoid awkward sequences of letters, like cooperating or cooperative. Other than that, keep hyphenation to a minimum. Like quotation marks, it’s distracting
Only use them when essential and never begin a sentence with an abbreviation. They produce a stilted, jerky effect. The same applies to acronyms. If you’re using lesser known acronyms, spell out what they stand for the first time. For example, 21st Century Network (21CN).
As a general rule, write numbers from nought to nine as words, and from 10 onwards as digits. However, try to avoid mixing numbers and digits in the same sentence. Write all ordinals - first, second, third and so on - as words.
Write dates as day, month, year, with no punctuation and the month spelt out, like this 23 July 2008.
Express time using the 24-hour clock. For example, 08:00 to 17:30.
Where numbers are associated with measurements, the value should always be placed right up against the unit, like this 550mm or 25km or 50Mbit/s or 20kg.
The text style suggestions in the left-hand column of this page provide only a basic guide.
You may well have your own preferences. However you choose to do it, the golden rule is consistency.
Inconsistency is probably the worst possible thing you can present a reader with; whether it's in your writing style or, even more importantly, in the way you express your sales and marketing messages.
Every different expression of the same message only confuses the reader.