With few exceptions, a comma should not separate a subject from its verb.
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My friend Cleo, is a wonderful singer.
Writers are often tempted to insert a comma between a subject and verb this way because speakers sometimes pause at that point in a sentence. But in writing, the comma only makes the sentence seem stilted.
My friend Cleo is a wonderful singer.
Be especially careful with long or complex subjects:
The things that cause me joy, may also cause me pain.
The things that cause me joy may also cause me pain.
Navigating through snow, sleet, wind, and darkness, is a miserable way to travel.
Navigating through snow, sleet, wind, and darkness is a miserable way to travel.