on Just Publishing Advice:

In general, you don’t use a comma before because in most sentences. When you add a second clause to a sentence starting with because the meaning is usually quite clear.

You are explaining the reason why something happened in the first clause. For example, I’m always hungry now because I’m on a strict diet.

Of course, if you start a sentence with because there is no comma either. Because I’m on a strict diet, I’m always hungry now.

But there are times when you need to think about using a comma.

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