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Internal linking is a space where nothing works more than experiments and trying... talking from the experience that with reference to internal linking the website reacts differently... i think overdoing of links from video to category pages will be a bit of a problem in my opinion but if you set it nicely then i guess its fine!

Yes I would do that, it's the best solution, redirect every corresponding page to the new one, and redirect the rest of the pages to the homepage / most relevant area. I can't see any issues with doing it this way. 404's won't transfer any of the weight over to the new site so would be a waste IMO.

Hey Robert The best way to think about this is from a user perspective and both categories and tags are useful structures to organise and browse content. So, from a pure user perspective, which is what really matters here, then, yep, use both. But, you are right in that this can be a problem with WordPress in that it can create so many different taxonomies which are essentially duplicate pages. If we consider a single user  blog you could have homepage author page tags categories date archives All of which can be duplicated or substantially duplicated. If you don't use the read more tool as well this can be made worse. Fortunately, there is a really easy way to deal with this and the Yoast WordPress SEO plugin will pretty much do the job for you. Install that and then just noindex all of your non essential landing pages to keep the uniqueness as high as possible. Again, much of what you do here depends on how you use the categories. Will you have one parent category that has everything in it or lots of parent categories? Are these landing pages? Could you not build your content and build better landing pages if you no indexed them all? If you have several categories and articles are only going in one category then by all means index them and try to add some unique content to each one beyond the post previews. Maybe use the excerpt on categories and a snippet on the homepage to keep them even more unique. Plenty of options, no right or wrong answers, just try to keep the site as unique as possible and the above should give you plenty to be going on with. Shout if you have any questions! Marcus

I believe the best way to proceed here is to change your quality backlinks to the new URLs as well as do 301 redirects.  In the end you are rebuilding your blogs authority at the new domain 301 redirects just help the process.