One space follows a period after an initial.
If there is more than one initial, there is no space after the period which separates them. After the period after the last initial there is one space.e.g. T.S. EliotAfter a period at the end of a sentence you do two spaces, but often only one is done.
Normally two spaces indicates the end of a sentence.
The number of spaces that follow an abbr. is one.
no spaces
2 Spaces
In typing, proper style is 2 spaces after a period (.), as well as after a colon (:).
It used to be 2 spaces but nowadays it is only 1.
one
There aren't any spaces after the apostrophe in a contraction (did you see what I did?)
None!
none
2