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It is good to not to use the canonical tag on your website but if you have the subdomains for your website and the content is the same for the both then you need to use the canonical tag. If you have...

Are you asking for the blog link or blog post links. If you are asking for the blog post links so you can share on the socila media sites, also in guest post sites in you content but must be related...

It means you have built bad and spammy links to your website from the spammy websites or through automated backlink generator.

I never use this technique and do not know it is good or not, but some SEO said it is good.

You mean, you want to create backlinks easily and seems it is easy to process to build backlinks, so, remember one thing if you are looking for the website that provided you with the link easily...

You can use two or three relevant tags.

The important points to focus on to get better ranking and results.

You can share your blog links on Social Media sites, Social Bookmarking site and on Forums too but to share any link on the forum should be relevant to the thread and having the well optimized and...

As quality content matters for SEO. The well-optimised webpage is also necessary.

It is not important. Who said above, it is important for the backlinks so be ready for the penalty. Most of Social Bookmarking sites are Nofollow means provide nofollow links and the one who gives...

Yes, Dmoz is closed now.

BTW, answer this question is a BIG NO but you can rank #1 in quick time by targeting the rare keywords those people search very rarely.
Another thing if you are talking about ranking so there is...

Guest post on niche and authority website help you to rank your web pages on SERP but as per the Google's Guidelines Guest Blog are not allow to give you a do-follow link, there are some blogs that...

The best free tools for Keyword research are Google Adwords Keyword Planner, Ubersuggest, WordStream and KeyWordTool.io

The tools I use, Google Adwords Keyword Planner, KeywordTool.io, Google Webmasters Tool, Google Analytics, SEO Profiler, SEOSiteCheckup, OpenSiteExplorer, Grammarly, Copyscape, Siteliner, Plagrisma.

I think OP is not interested to know the answer to their query or just post thread for increase post count?

DA, PA is nothing to do with links, these are MOZ metrics and Google has nothing to do with that and Link Exchange is also not a recommended technique so if you are doing this, you can take risk...

Dofollow links helps you to increase the authority of your website if they are from high authority website from your niche where Nofollow links nothing to do with the ranking directly because...

Exactly, the quality and valuable information in the website help to increase the usability and build trust. Another thing is relevancy, if the content or information is relevant to the user query...

I don't think there is something wrong to do this but for what purpose you are asking this question?