It works in a similar way as a canonical tag does to show when a duplicate version of a page exists. But in this case, it helps Google index local content easier within local search engines. It also helps to pass trust across sites and improve the way Google crawls these pages. To know more about how errors you should not make when it comes to hreflang tags, you can check our previous article.
For our client: We only used a smaller quantity of very high-quality link building each month. So, for example we only built 40 of the best links each month to supplement the work we were doing on the content marketing front. We also invested heavily into tracking competitor backlink profiles, using Majestic SEO and Open Site Explorer. We worked out how the competitor's acquired specific backlinks, then by using outreach and content creation we obtained these links.
There is absolutely no reason why your on-page optimization should not be perfect. It can mean the different between your website showing up on page three of the search results and your website being the top listing. We encounter so many local businesses that simply ignore their on-page optimization (or the prior SEO company didn’t optimize correctly).

SEO (search engine optimization) for organic search: SEO is a free method of SEM that uses a variety of techniques to help search engines understand what your website and webpages are about so they can deliver them to web searchers. These techniques include things like using titles, keywords and descriptions in a website and webpage's meta tags, providing relevant content on the topic, using various heading tags (i.e.

), and linking to and from quality online resources. 
Page and Brin founded Google in 1998.[22] Google attracted a loyal following among the growing number of Internet users, who liked its simple design.[23] Off-page factors (such as PageRank and hyperlink analysis) were considered as well as on-page factors (such as keyword frequency, meta tags, headings, links and site structure) to enable Google to avoid the kind of manipulation seen in search engines that only considered on-page factors for their rankings. Although PageRank was more difficult to game, webmasters had already developed link building tools and schemes to influence the Inktomi search engine, and these methods proved similarly applicable to gaming PageRank. Many sites focused on exchanging, buying, and selling links, often on a massive scale. Some of these schemes, or link farms, involved the creation of thousands of sites for the sole purpose of link spamming.[24]
Remember when you used to rely solely on search engines for traffic? Remember when you worked on SEO and lived and died by your placement in Google? Were you #1? Assured success. Well, okay, maybe not assured. Success only came if the keywords were relevant to your site users, but it was the only real roadmap to generating site traffic and revenue.