Hi! I really found this article to be valuable and helpful to improve our SEO techniques. But I am just wondering regarding the dead links, does that mean we can contact those who have dead links to recreate the page? How does it improve my SEO technique for my website? Can they add some citations or thank you or gratitude section that links to our website?

When would this be useful? If your site has a blog with public commenting turned on, links within those comments could pass your reputation to pages that you may not be comfortable vouching for. Blog comment areas on pages are highly susceptible to comment spam. Nofollowing these user-added links ensures that you're not giving your page's hard-earned reputation to a spammy site.
Many blogging software packages automatically nofollow user comments, but those that don't can most likely be manually edited to do this. This advice also goes for other areas of your site that may involve user-generated content, such as guest books, forums, shout-boards, referrer listings, etc. If you're willing to vouch for links added by third parties (for example, if a commenter is trusted on your site), then there's no need to use nofollow on links; however, linking to sites that Google considers spammy can affect the reputation of your own site. The Webmaster Help Center has more tips on avoiding comment spam40, for example by using CAPTCHAs and turning on comment moderation.
Add relevant links back to your site. Throughout your answer, sprinkle a few relevant links back to your website. The more relevant they are to the question, the more clicks and traffic they will generate. You can also finish your answers with a link to your lead magnet, concluding with something like this: “Want to know more about how to start a business? Check out my free checklist with 10 steps for starting your first business!” and a link to the lead magnet (in this example, the checklist).
The leading search engines, such as Google, Bing and Yahoo!, use crawlers to find pages for their algorithmic search results. Pages that are linked from other search engine indexed pages do not need to be submitted because they are found automatically. The Yahoo! Directory and DMOZ, two major directories which closed in 2014 and 2017 respectively, both required manual submission and human editorial review.[40] Google offers Google Search Console, for which an XML Sitemap feed can be created and submitted for free to ensure that all pages are found, especially pages that are not discoverable by automatically following links[41] in addition to their URL submission console.[42] Yahoo! formerly operated a paid submission service that guaranteed crawling for a cost per click;[43] however, this practice was discontinued in 2009.
This philosophy is beautiful in its simplicity, and it serves to correct the “more, more, more” mentality of link building. We only want links from relevant sources. Often, this means that in order to scale our link-building efforts beyond the obvious tactics, we need to create something that deserves links. You have links where it makes sense for you to have links. Simple.
When referring to the homepage, a trailing slash after the hostname is optional since it leads to the same content ("https://example.com/" is the same as "https://example.com"). For the path and filename, a trailing slash would be seen as a different URL (signaling either a file or a directory), for example, "https://example.com/fish" is not the same as "https://example.com/fish/".
5) Post at the right time. Let’s say you want to post in the r/Entrepreneur/ subreddit, but there’s already a post in the #1 spot with 200 upvotes, and it was posted 4 hours ago. If you post at that time, you probably won’t overtake that #1 spot, and you’ll get less traffic. However, if you wait a day, check back, and see that the new #1 spot only has 12-15 upvotes, you’ll have a golden opportunity. It will be much easier for you to hit the #1 spot and get hundreds of upvotes.
Elna, I love it when pro bloggers write how-to posts that are highly highly valuable to their readers. This one is top notch … as you will see by how I share my NAME and blog with this comment. What a brilliant idea that I could never have thought of on my own EVER. This one is getting pinned all over the place. I love sharing content that really helps people.