Grammarly
Grammarly Blog: Comma Between Two Nouns in a Compound Subject or Object
This page focuses on the misuse of a comma by placing one between the two nouns in a compound subject or object. It provides examples of its misuse and explains why it is not correct.
Grammarly
Grammarly Blog: When to Use Commas and When Not
This page focuses on the uses and misuses of commas. It provides examples of comma uses and explains when the commas are unnecessary.
Grammarly
Grammarly Blog: Comma With Subjects and Verbs
This page focuses on the misuse of a comma when it is used to separate the subject of the sentence from the verb. It provides examples of such sentences and one exception to the rule.