It's hard to know how many keywords you should use on a page for the best SEO benefit. Because it always depends on the length of the content but it should not be used mo...

Here is the thing you can do, Use Crawlable Anchor Links:- Your root page URL should be like - example.com/category 2nd page URL Should be like - example.com/category?pag...

You can disavow the backlink in Webmaster Tools. https://support.google.com/webmasters/answer/2648487?hl=en

What are you referring to? How many times to repeat the targeted keyword or how many target keywords per page?

Google found a page title duplicated when it matches exactly same as other page URL. Adding page ids to each of the paginated pages could resolve this issue. For example,...

Thanks, I’ll go for anchored links!

Changing IP should not have long term impact on your ranks, unless you were assigned some bad IP with terrible reputation. As long as your DNS is set correctly, domain sh...

Pretty good thinking actually. I'd probably do the same - merge pages (that are not robust enough to sit around as a standalone pages) into one/few. That would basically...

I would expect a near term hit to traffic and rankings with either setup. I personally think b2c makes more sense as a primary page. Might just be my preference though.

Google takes a while to update. Stop worrying so much about backlinks. They don't matter all that much. You're just wasting time when you could be making new content.