Google claims their users click (organic) search results more often than ads, essentially rebutting the research cited above. A 2012 Google study found that 81% of ad impressions and 66% of ad clicks happen when there is no associated organic search result on the first page. Research has shown that searchers may have a bias against ads, unless the ads are relevant to the searcher's need or intent 
For our client: We rolled out a successful implementation of rel="author" for the three in-house content writers the company had. The client had over 300+ articles made by these content writers over the years and it was possible to implement rel="author" for all the aged articles. I advise anyone who has a large section of content to do so as it will only benefit the website. We were also in the process of rolling out further schema markup to the site's course content as it only has a benefit for CTR.
Understanding the working mechanism of social algorithms is not a piece of cake. The algorithm for each social platform works differently. For instance, on Facebook, a core factor that affects the rankings of a post is its relevancy score, whereas on YouTube the total watch time of the video per session decides whether a video enters a ‘Recommended Video’ section or not.
An important thing to note is the effect that localized searches will have on search engines. For example, say you’re in Atlanta and you’re looking for a photographer for your wedding. When you search “wedding photography” it wouldn’t be helpful to see results of photographers in Los Angeles. This is why Google takes into account where you are when you search for certain words, and shows you listings from businesses that are close in proximity to you.
Many page owners think that organic reach (the number of unique individuals who see your post pop up in their news feeds) is enough to make an impact. This was true in the first few years of Facebook but is no longer the case. Facebook, and many other social media networks is truly a pay-to-play network. Facebook, Twitter, Instagram, and LinkedIn are all on algorithmic feeds, meaning posts are shown to the user based on past behavior and preferences instead of in chronological order. Organic posts from your Facebook page only reach about 2% of your followers, and that number is dropping. Facebook recently announced that, in order to correct a past metrics error, it is changing the way it reports viewable impressions, and organic reach will be 20% lower on average when this change takes effect.
There is no one size fits all formula when it comes to social media marketing. For instance, a fast food chain restaurant could find a large number of people ordering food on their website with a single organic Facebook post, and on the other hand a medium-sized mobile app development company may see dramatic results with a promoted post on LinkedIn.
Link building is a catchall term for the practice of creating new external links to your site. Beyond creating great content people want to share, guest blogging and asking webmasters from authoritative sites relevant to your business to link back to your pages are great ways to build links. When possible, use keywords are the anchor text for your links, as this will help send signals to Google that your pages are relevant for those terms.
BrightEdge research supports that a blended approach is best for delivering high performing content. Not only will combining organic and paid search increase website traffic, but it will offer a bigger return on the investment. Take Retail, Technology and Hospitality industries, for example — organic and paid search combined make up more than two-thirds of their total revenue.