i have a website with some pretty good ranking and SEO that I don't want to hurt, I have an SEO consultant that is working on it and I know he doesn't do any black-hat stuff.
Now I'm launching a new website and I want to try and do the off-page SEO for myself, or hire someone new that I didn't work with yet.
I'm afraid that the new guy I hire will use black-hat techniques, spam or things like that, and get the new site penalized. It might even happen if I do the off-page SEO for myself. I might make a mistake , since it'll be my first time doing off-page SEO by myself.
I read that if one website is penalized by Google, other sites may also be penalized if they belong to the same owner.
As for how Google can recognize that they have the same owner I'm not sure, one idea is according to the Google Webmaster Tools account.
Anyway, there might be also other factors that don't occur to me that might cause Google to decide the two websites are connected somehow.
Does anyone know if this is true or has any experience with this? How can I make sure the two websites aren't considered connected by Google?
And how do I make sure the new website doesn't hurt the old one in case the new SEO consultant uses blackhat techniques and the new site to be penalized?