When a page is linked from another page of the same website it is called internal linking. When a web page is linked from another website it is called backlink.

Okay great. Thanks for the reply.

To resolve the issue of directory sessions appearing in the old Analytics account, you need to create a separate Google Analytics property for the new sub-directory (abc....

Yes @jonduv, It will benefit in all the way.

Thanks for the reply. Okay, nofollow is what I was thinking as well. In general though, do you feel linking out to certification sites is beneficial? Appreciate your inpu...

thank you.. can you give me an example please of internal linking and backlinks ?

Who gave you negative backlinks? There is no such thing as "bad" backlink in terms of negative context. For example, "I don't like www.example.com" do...

Nofollow links will be better to those external links.

Keep updating the pages somehow everyday and have patience. It will certainly be fruitful.

Yes, it happens. Internal linking of pages and backlinks resolve the issue.