Secure (https) to non-secure sites (http): Since Google began emphasizing the importance of having a secure site, more websites are securely hosted, as indicated by the “https” in their URLs. Per the security protocol, however, any traffic going from a secure site to a non-secure site will not pass referral information. For this issue, you can correct by updating your site to be secure through a third-party SSL certificate.

Implementing structured data markup (such as that from might seem like a one-time project, but that “set it and forget it” mentality can land you in hot water. You should be monitoring the appearance of your rich snippets on a regular basis to ensure they are pulling in the correct information. As you change the content on your website, this can alter the markup without warning.
The Forums – yes, I know some bloggers are telling you that you can not get anything from the Forums, but I can prove them wrong. One example: I met one of my dear blogging friends on a Forum way before I started blogging. She has been helping me since. Instead of struggling with some newbie mistakes, I skipped most of them and went straight for success. Most forums allow links in signatures – use it!
Search engines (especially Google) are unpredictable. No matter how adept you are at using the AdWords keyword planner or how targeted your SEO strategy is, you can never be completely sure which of your blog posts or even your landing pages will perform the best — and which keywords they’ll rank for when they do. You’ve got to hit publish, then wait to see how the results shake out over time (and it can take months for a post to gain, or not gain, the traction you’re looking for).
Understanding how people landed on your website is a key component of optimization. If you’ve ever looked at Google Analytics (and if you haven’t you should), you’ve probably seen the words “Direct,” “Referral,” and “Organic” in relation to your traffic. These are the sources where your users come from — or what Google calls channels. But what do these words really mean, and why do they matter?
Cheers for sharing that thread, I'd not read it. I think most of the confusion here arises because of how standard GA reports work on a last non-direct click basis - if there's a previous campaign within timeout, that user will be attributed to that campaign, even if they're technically returning via direct. MCF reports are the exception, of course, given that they show *actual* direct.
We are in the SEO industry for a while now, wearing many hats: digital marketers, tool developers, advisers, researchers, copywriters, etc. But first of all, we are, just like you, site owners. And we’ve been through ups and downs regarding organic traffic, and we were in the situation of trying to understand why the Google traffic dropped dramatically at some point as well. Having all these in mind, we’ve thought of easing your work, and we’ve put together a list with the top 16 reasons that can cause sudden traffic drop, unrelated to Google algorithm changes or penalties.
Organic traffic is the primary channel that inbound marketing strives to increase. This traffic is defined as visitors coming from a search engine, such as Google or Bing. This does not include paid search ads, but that doesn’t mean that organic traffic isn’t impacted by paid search or display advertising, either positively or negatively. In general, people trust search engines, and sayings such as “just Google it” reinforce that humans are tied to the search engine. Thus, paid search, display, or even offline campaigns can drive searches, which may increase organic traffic while those campaigns are running.