This way, when you do drive traffic, you know where that traffic is coming from. Otherwise, you're left in the dark. For example, if you do some content marketing on Quora.com or Medium.com, you could use the campaign source as simply Quora or Medium and the campaign medium as content_marketing and the term as the term you're working to rank for. Get the picture? Then, you'll see all the beautiful results directly in Google Analytics and you'll know specifically where your traffic came from.
No, unfortunately we can not guarantee that the absolute safety of Google Adsense Traffic. This is because we have seen instances in which websites were penalized for receiving large bulks of traffic (and clicks) to their Google Adsense ads. Therefore, if you use it, we strongly recommend you to use it in moderation and in conjunction with other traffic sources. More information >>