Hello there ! Everything is in the subject of this post but here is the context : we are a web agency and we, among others, build websites for our clients (most of them are shops). Until now, we put a link in their footer, like "developped by MyWebShop". But we don't know if it is bad or not. With only one website we can have like hundred of backlinks at once, but is it good for SEO or not ? Will Google penalize us thinking that is blackhat practices ? Is it better to put our link in the "legal notices" or "disclaimer" part of the websites ? What is the best practice for a lasting SEO ? I hope you understand my question, Thnak you in advance !