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Thanks Martin for your answer - you might be right but there are a bunch of cluttering links/related posts/authors info etc. at the post which might "damage" the SEO power. On my pages there are much less such issues.

I'm also thinking of having some kind of "landing" pages for the most common keywords and work on them from time to time, instead of having a post which will be needed to get re-written then.

I know WordPress is always a little messy with SEO but i have a main question regarding WordPress optimisation for a special keyword.

Let's say i have a chocolade blog and have written about all the vendors of chocolade. Now i found a new keyword which i want to optimize my website for.

1. Should i create a 'Page' within WordPress and optimize it for the new keyword + link to some of the post about a relative keyword within this page?
   OR
2. Should i create a blog post and write about the new keyword and just links some of the other relative blog posts?

I hope my question is clear.

Thanks Robert for the detailed answer. Very helpful!

I have recently switched my images to a CDN (MaxCDN) and all of the images within my post are now get loaded directly from the CDN.

Will this affect my Google ranking? Do Google care if the image is hosted physicaly on the domain?