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It's not mandatory to have Robots.txt file but it a Good SEO practice. Robots.txt file is the first thing for which Google bots look after. As we mention which all search engines are allowed to crawl...

While building the backlinks make sure you are creating backlinks of both Dofollow and Nofollow links. And have variation of backlink like don't have backlink only of either Bookmarking, Forums,...

Thanks for sharing the brief content on what is long tail keywords and why targeting these keywords is beneficial. Will definitely try to implement the suggested tips to rank blogs.

In order to increase the CTR of the website, you need to improve the On Page of the website. Write effective Title & Description, which makes person to click and visit your website.

Another method...