After full stops
Corporate style uses only one space after full stops. Proportional fonts have built-in space which varies depending on the individual font and characters used. This is why only a single space needs to be inserted after a full stop. It also looks more professional to use a single space after a full stop. Typesetters and printers use only a single space.
Between lines of text
The spacing between lines of text is called leading. Leading needs to be sufficiently well spaced so that the lower strokes of characters on one line of text do not overlap with the upper strokes of characters on the following line. Otherwise the text can be difficult to read, particularly for people with visual disabilities. And the bigger the text, the larger the leading needs to be.
If you use single line spacing in Word, the leading will be adjusted automatically to suit the text size.
It is particularly important for large-print documents to have adequate leading, so consider using between 1.5 and 2.0 line spacing for large print.
Avoid using large amounts of space between headings and subsequent paragraphs of text, otherwise they don't look as if they belong together.
If you use a line of space between headings and paragraphs, you run the risk of headings being left behind at the end of pages when the paragraph of text shifts to a new page. If you want to include some space between the two, set the space up as part of the paragraph style. To do this:
You can also format your heading style so that it stays with the next paragraph. To do this: