Generally, you use a comma before "etc." if it's at the end of a list:
* Example: We offer a variety of services, such as web design, social media marketing, content creation, etc.
You don't use a comma before "etc." if it's within the list:
* Example: We offer services like web design, social media marketing, content creation, etc.
However, these are just general guidelines. The best way to decide whether or not to use a comma is to consider the flow and clarity of your sentence.
Here's a breakdown of when it might be better to use a comma before "etc.":
* If the list is long: Using a comma can help to separate the list elements and make the sentence easier to read.
* If the list is complex: A comma can clarify the meaning and prevent ambiguity.
Ultimately, it comes down to what sounds best and reads best to you.