You can confer some of your site's reputation to another site when your site links to it. Sometimes users can take advantage of this by adding links to their own site in your comment sections or message boards. Or sometimes you might mention a site in a negative way and don't want to confer any of your reputation upon it. For example, imagine that you're writing a blog post on the topic of comment spamming and you want to call out a site that recently comment spammed your blog. You want to warn others of the site, so you include the link to it in your content; however, you certainly don't want to give the site some of your reputation from your link. This would be a good time to use nofollow.

Attempting to replace a dead link with your own is easily and routinely identified as spam by the Wikipedia community, which expects dead links to be replaced to equivalent links at Persistent attempts will quickly get your account blocked, and your webiste can be blacklisted (the Wikipedia blacklist is public, and there is evidence that Google uses it to determine rankings), which will have negative SEO consequences.
I am a newbie in the blogging field and started a health blog few months back. I read so many articles on SEO and gaining traffic to a blog. Some of the articles were very good but your article is great. Your writing style is amazing. The way you described each and every point in the article is very simple which becomes easy to learn for a newbie. Also, you mentioned numerous of ways to get the traffic to our blog which is very beneficial for us. I am highly thankful to you for sharing this information with us.
WebEngage is an effective tool through which you can collect the customer insights through laser target surveys. It delivers drag and drop option to make a form that helps different types of questions. When you properly setup the form, you can gather answers from your relevant audience. It also provides real time data and information of every survey in a form of report which you can download easily.
Thanks Brian for your article. I am in the healthy living niche. I want to team up with bloggers in my own niche where we can share material it makes sense to me. But I have my own unique message and that is what I have been devoted to! Dah! I see now that my focus should be on what is popular among my peers and add to this. I think I’m finally getting the picture! I am specifically into FOOD MEDICINE perhaps I should start writting about the dangers of a Gluten free diet! Not for everyone!
If you are using Responsive Web Design, use meta name="viewport" tag to tell the browser how to adjust the content. If you use Dynamic Serving, use the Vary HTTP header to signal your changes depending on the user-agent. If you are using separate URLs, signal the relationship between two URLs by  tag with rel="canonical" and rel="alternate" elements.