In the sync setting for SFDC to HubSpot, under activities there is a large list of option.
“Sales content viewed” - What is the definition of sales content vs marketing content?
Is there a defninition library I can see all the activity sync definitions?
Hey @Huntscape-Ops,
Welcome to the community!! 
Great question! It seems our KB article here should point you in the right direction:
Hope this helps!!
Sam, Community Manager
I have read the articles. They do not define “Sales Content”
Hey @Huntscape-Ops,
Thanks for confirming – to better point you in the right direction this is listed as:
“Sales document is viewed by a contact (if sync is turned on for that activity).”
Hope this helps clarify!
Sam, Community Manager
What does gaming content have to do with anything
Hey @Huntscape-Ops,
I’ve marked the User as spam and removed the content to help keep the thread relevant!
Thanks!! 
Sam, Community Manager