Is it bad for SEO to have two very similar sites on the same server? What's the best way to set this up?

I own a website (domain.com) and used the subdomain "dev.domain.com" while adding a new section to the site (as a development link). I forgot to block the dev.domain.com in my robots file, and google indexed all of the dev pages (around 100 of them). I blocked the site (dev.domain.com) in robots, and then proceeded to just delete the entire subdomain altogether. It's been about a week now and I still see the subdomain pages indexed on Google. How do I get these pages removed from Google? Are they causing duplicate content/title issues, or does Google know that it's a development subdomain and it's just taking time for them to recognize that I deleted it already?

Hello, Noticed a lot of sites, usually wordpress (seems to be the default) have the images in their posts clickable that load to their own page, showing just the image, usually a .jpg page. I know these pages seem to be easily indexed into google image search and can drive traffic to those specific pages... My questions are... 1. What is the point of driving traffic to a page that is just the image, there are no links to other pages, no ads, nothing... 2. can you redirect these .jpg pages to the actual post page? I ask because on google image search, there are 3 links to click (website, image link, image page), when you click to view the image, it loads the .jpg page, why not have that .jpg redirect to the real content page that has ads and also has other links. Is this white-hat? 3. Do these pages with just images have any negative effect on optimization since they are just images, no content? 4. Can you monetize these .jpg pages? 5. What is the best practice? I understand there is value in traffic, but what is the point of image traffic if I can't monetize those pages?

Hello, I have a website with tags (which have the noindex tag) on each article post. I've been told that I should noindex/nofollow these tag pages, because they are getting link juice passed to them, and since they aren't getting indexed, it's wasting link juice to those pages, when the link juice could be passed to a page that is actually getting indexed. What are your thoughts on this? Also, what would be the point to noindex/follow a page, if you are noindexing that page? Isn't it just wasting link juice? What is the proper SEO way to optimize tags.

Is it wise to focus on multiple niches for one site, rather than zoning in one or two different niches? On one hand, you can target many more topics and go after tons of keywords, but on the other hand doesn't google get confused of what your site is really about? Won't google just focus on one of the niches that you provide more than all others? Any input would be great!

If a blog is centered around visual images, and we have specific pages with high quality content that we plan to index and drive our traffic, but we have many pages with our images...what is the best way to go about getting these images indexed? We want to noindex all the pages with just images because they are thin content... Can you noindex,follow a page, but still index the images on that page? Please explain how to go about this concept.....

My main concern is about the entire tags strategy. The whole concept has really been first seen by myself on WordPress which seems to be bringing positive results to these sites and now there are even plugins that auto generate tags. Can someone detail more about the pros and cons of tags? I was under the impression that google does not want 1000's of pages auto generated just because of a simple tag keyword, and then show relevant content to that specific tag. Usually these are just like search results pages... how are tag pages beneficial? Is there something going on behind the scenes with wordpress tags that actually bring benefits to these wp blogs? Setting a custom coded tag feature on a custom site just seems to create numerous spammy pages. I understand these pages may be good from a user perspective, but what about from an SEO perspective and getting indexed and driving traffic... Indexed and driving traffic is my main concern here, so as a recap I'd like to understand the pros and cons about tags on wp vs custom coded sites, and the correct way to set these up for SEO purposes.

I have old pages on my site that I want to 410 so they are totally removed, but later down the road if I want to utilize that URL again, can I just remove the 410 error code and put new content on that page and have it indexed again?

If you have massive pages with super thin content (such as pagination pages) and you noindex them, once they are removed from googles index (and if these pages aren't viewable to the user and/or don't get any traffic) is it smart to completely remove them (404?) or is there any valid reason that they should be kept? If you noindex them, should you keep all URLs in the sitemap so that google will recrawl and notice the noindex tag? If you noindex them, and then remove the sitemap, can Google still recrawl and recognize the noindex tag on their own?

Hello, I know that Google says that you are supposed to make anchored text links nofollow on press releases, but what about just putting the site url itself (example.com) and making it dofollow? Is that okay?

If you have a site with a few thousand high quality and authoritative pages, and tens of thousands with search results and tags pages with thin content, and noindex,follow the thin content pages all at once, will google see this is a good or bad thing? I am only trying to do what Google guidelines suggest, but since I have so many pages index on my site, will throwing the noindex tag on ~80% of thin content pages negatively impact my site?