Introductory clauses, phrases and words are:

• Clauses, phrases or words that are not sentences.
• Clauses, phrases or words that provide extra information.
• The sentence makes sense with out the clause, phrase or words.
• Clauses, phrases or words that come at the beginning of the sentence.
• They are used as background information, extra information.
• There can be more than one introductory clause, phrase or word in a sentences.

Commas are placed after the introductory clause, phase or words. If there is more than one introductory clause, phase or words a comma is placed after each introductory clause, phase or words.

Examples:

Wow, that was a great movie.

While I got dressed, The radio was playing a great song.

Excellent job, everyone did a really good job.

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Comma Usage

Comma Usage - Lists

Comma Usage - Independent Clauses

Independent and Dependent Clauses

Nonessential Clauses-Commas

The Difference between Clauses or Phrases

Introductory Phrases, Clauses and Words with Commas

Commas Usage With Titles, Dates & Addresses