I have a WP blog and it ranks well, it's an aged domain, but it looks dated and loads slowly. So I am moving the site to a better server and have a new theme and now Yoast SEO. There are some posts that are old and outdated and I wonder if deleting them will hurt. They hardly get traffic. Also, I have some old posts that aren't original from a ezinearticles or something and I'd like to get rid of those and only keep good original content and don't know if that will hurt to delete either. And lastly, the site was set up as domain/category/post and I've heard that domain/post is better. Dunno the truth. THANK YOU!