And two more ...

5. Links from Wiki-like sites will generate higher rankings

I admit, is quite easy to find some logic in the above statement. Hence the danger ...

Unfortunately, isn't true.

As Google clearly stated:

Wikipedia and other similar sites are ranked just like everyone else on the web: by counting the "total" value of links to a given PARTICULAR page.

6. All links should be rel=nofollow

This is a really dangerous one!

There are lots of recommendations on the web calling for making all links nofollow.

And fact is, a natural backlink profile usually has a considerable number of nofollow links.

Why? Because, without nofollow the web would sink in spam ...

Still, most links on the web are still dofollow!

Why? Well, nofollow links do not pass any value ... Now imagine that all your links are nofollow. And they all have the same link quality. There is no domain authority. How would search engines evaluate your site?

The point: making all your links nofollow can damage your SEO!

So hear me out! As a general rule, try to keep a balanced profile.

Nofollow was introduced to cut on spam, so ...

6.1 Set up a nofollow rule for the comments section or any other place where people can add their own links

6.2 Add a nofollow tag for those links that you want to keep but dont want to be indexed