In typing, proper style is 2 spaces after a period (.), as well as after a colon (:).
no spaces
2 Spaces
2
1
Commas do not go at the end of sentences. Periods go at the end of sentences. Generally when typing on a computer, you should have two spaces after the period at the end of a sentence.
no spaces
2 Spaces
It used to be 2 spaces but nowadays it is only 1.
one
2
2
one space after and abberviation two spaces at the end of a sentence
One space follows a period after an initial.
One.
1
How many spaces do you need after the word period? Is she having her period.
One space between words. No space between the last word and the period or interrogative. Two spaces after the period or interrogative.