Grammar
Style guide 
Using ellipses
Reader's question: If you have a full stop then an ellipsis, do you have three dots or four?
Online grammar answer: We use ellipses to indicate that we have left out material we’re quoting from. An ellipsis is always three dots ( ... ).
That’s where agreement about ellipses ends!
Full stop or no full stop?
Some style guides say that if an ellipsis follows a sentence, use a full stop and have a character space before the ellipsis.
The weather forecast was for rain and sleet. ... He went anyway.
Other style guides say that you do not need a full stop to indicate the end of a sentence if it is followed by an ellipsis.
The weather forecast was for rain and sleet ... He went anyway.
Spaces or no spaces?
With ellipses, you need to decide whether to use the Microsoft Word default or add spaces between your dots.
He droned on and on ...
He droned on and on . . .
You also need to decide if you want spaces before and after an ellipsis.
He droned on and on...the audience grew restless.
He droned on and on ... the audience grew restless.
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Other grammar tips include:
colons
em and en rules
hyphens