Hello Mozzers! Say there is a website with 100 pages and a domain authority of 25. If the number of pages on this website increases to 10,000 can that decrease its domain authority or affect it in any way?

Howdy Mozzers! We would like to use no follow, no index on our magento layered navigation pages after any two filters are selected. (We are using single filter pages as landing page, so we would liked them indexed) Is it ok to use nofollow, noindex on these filter pages? Are there disadvantages of using nofollow on internal pages? Matt mentioned refraining from using nofollow internally https://www.youtube.com/watch?v=4SAPUx4Beh8 But we would like to conserve crawling bandwidth and PR flow on potentially 100's of thousands of irrelevant/duplicate filter pages.

Howdy Mozzers! Our magento store URL's are accessible with or without a trailing slash at the end. Canonical's and 301 redirects are not set up for one of them at the moment. Will this cause duplicate issue? Do we need to set canonical or 301 up? Which one is recommended? MozAddict

I have seeon some trends for sites which do not even use XML sitemp and robots e.g. see this site. How do you see if sitemap is not used. Also for classified websites, should ad pages be included in sitemap because after certain duration those ads will be deleted and google might not be able to crawl. What do you suggest about XML sitemap for classified website.