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?)
2
2
one space after and abberviation two spaces at the end of a sentence