Optimise for your personas, not search engines. First and foremost, write your buyer personas so you know to whom you’re addressing your content. By creating quality educational content that resonates with you>r ideal buyers, you’ll naturally improve your SEO. This means tapping into the main issues of your personas and the keywords they use in search queries. Optimising for search engines alone is useless; all you’ll have is keyword-riddled nonsense.
So what does this mean? “Bounce rate” can be thought of as a measure of engagement. If visitors are moving around your site, they are engaged. If they are bouncing, they cannot think of a good reason to stay. There is one notable exception to this: Blogs, videos, and news sites often have higher bounce rates because a visitor reads a particular article or watches a video and then leaves. For an ecommerce site, however, you would like to see relative low bounce rates. Sources that bounce a lot are probably not providing quality traffic.
Simply great and agree with your all subject...! I like the way you explained. Each heading are awesome Create the best quality content and consistently, Long tail keyword is better, Guest blog for SEO is dead, and Aha....Do not anger Google. conclusion is awesome. Hard work and Patient is best practice to see the good results in any field. Really useful and helpful post indeed. Thank you.

Well, yes and no. Sure, you can get hit with an algorithm change or penalty that destroys all your traffic. However, if you have good people who know what they are doing, this is not likely to happen, and if it does, it is easy (in most cases) to get your visits back. Panda and Penguin are another story, but if you get hit by those it is typically not accidental.
Mobile traffic: In the Groupon experiment mentioned above, Groupon found that both browser and device matter in web analytics’ ability to track organic traffic. Although desktops using common browsers saw a smaller impact from the test (10-20 percent), mobile devices saw a 50 percent drop in direct traffic when the site was de-indexed. In short, as mobile users grow, we are likely to see direct traffic rise even more from organic search traffic.