Hello @RicoN8 ,
There's several bits to this, so let's break them down:
Possible duplicate content issue: isn't redirecting to (a 301 redirect would be best but a canonical could work) The WSB team and I aren't 100% sure what this point is referring to, but you're correct that we don't support 301 redirects. We're just not sure what you're trying to redirect or why because this point seems to have been cut off when you were typing this post out.
The blog title is within a sub folder, of a sub folder, within another sub folder. This should not actually affect the way that SEO functions. It might make it confusing for a human trying to program the site, but since everything is done automatically by programs this shouldn't be a problem.
Homepage internal links appear to be set to open new tabs. Any time you insert a link, in the link options there is a toggle for the 'open in new tab' feature.
If you need any clarifications, or additional guidance / 1:1 assistance, I'd recommend reaching out to the Website Builder support team directly.
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