When I was studying for my CELPIP exam I got material from them. Unfortunately, I can not put the PDF to the public because it has a watermark with my personal email. But I can put you here what it says.
CELPIP's seventeenth error as they state:
The comma is the most frequently used punctuation symbol in English. As a result, it is often responsible for the most errors. Since there is a dozen of instances where commas can be used, the rules for comma use are extensive. The most common are presented here. We suggest that you review Unit 2: Run-On Sentences since it also covers comma use.
You will use the comma in the following cases:
Commas should not be used to separate compound predicates.
Good luck!
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