I have a handful of domains that I bought that have their own anchor text from old links pointing to the URLs. Then currently I have those URLs forwarded to one of my websites that is loading it up with their anchor text. Will that hurt my website and if so what is the best way to take these URLs and get the juice out of them to my main website that I am working on with this subject matter?
Use a wildcard redirect and make pages on your money site that matched their URLs so that way Google sees it as if the website moved and not just someone trying to redirect links.
However, I typically only would move the most valuable site. For the other ones, I would build out content to match the previous topic and then use those articles to anchor text links to my new property.