This question already has an answer here:
If I have a domain like
http://example.com/ which would be the best to use for every new project I create. Would it be a subdomain
http://exampleprojectname.example.com/ or a new domain
http://exampleprojectname.com/ or a new folder
http://example.com/exampleprojectname. Which one would be the best and good for seo.