English Grammar Rules & Mistakes: Learn All of the Essentials: Writing, Speaking, Literature and Punctuation Rules Complete with 10 Key Skills and Over 200 Common Error Examples

A plain text without punctuation
Given the statement, “Woman without her man is nothing,” this appears
ambiguous, right? Let’s look at the punctuated texts below:
“Woman without her man, is nothing.” (meaning that men are important to
women)
“Woman, without her, man is nothing.”(meaning that women are important to
men)
The above mentioned illustration simply helps to know that punctuation can
help to differentiate meanings from words joined together to make sentences. 
Without punctuation, you won’t know exactly what the statement is talking
about.
All told, there are several punctuation marks commonly used in English
grammar. The commonly used ones are explained in this chapter.
a. Period (also known as a full stop)
b. Semicolon
c. Colon
d. Dash
e. Hyphen
f. Exclamation marks
g. Quotation marks
h. Apostrophe
i. Ellipsis
j. Comma
k. Question mark
Simply following the correct and appropriate use of these punctuation marks
will enable you to make good sentences and communicate effectively when
writing.
Period (.)

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A period can also be called a “full stop.” After you are done writing a
complete statement or sentence, it should end with a period. Also, period one
of the three punctuation marks used in ending sentences. An important thing
you should know about the period is that irrespective of the number of
abbreviations used in a sentence, a period must always come last, being the
final stop. There are a few rules to follow so as to avoid errors when using a
period.
Do not add another period to a sentence which already ends with a period.
If you have an abbreviation as the last word in a sentence, an additional
period will make the sentence erroneous. This is because, initialized words,
e.g., O.C.P.D., are already making use of periods (dots) to separate the letters
standing for each initial of each word. So, you must avoid adding an extra
period when the last letter is already accompanied by one.
Incorrect: Kindly wait for him. He’ll catch up with you