Full stops are used to end sentences. Only use one space after them. Do not use them after initials, or in titles, abbreviations or acronyms. They also should not be used in any heading, subheading, title, date or name that occupies a line to itself.
If a sentence’s final clause is in brackets, and that clause ends in ? or !, then there must be a full stop outside the brackets. Full stops should also be used to end release calendar summaries as screen readers need this to stop reading.
Mr J A Rank
“What do you think it is?”
(The thunder and lightning are terrifying!)