If i have the website, let's say www.car.com and i want to make a subdomain newcars.car.com or ferrari.car.com or something like this, google will see my subdomains as spam or as different sites ?!
Why would that be spam? Are you planning to have a copy of the original site? Then it would be considered a spammy site and most likely get removed from Googel.
I agree with allout.. If you had a.domain.com b.domain.com c.domain.com with all same content.. then Google would beat you.... Best of Luck!
I Know that, but is it ok to make a subdomain with very similar content as the main domain ? Can i place links from subdomain to the main site ?, ex.. from punk.music.com to music.com ? Not a copy of the site, if i have ww.car.com, on subdomain i will put bmw.car.com and all the content on subdomain will be about bmw.
Yes the sub domains are fine but how similar are you talking? If you are just changing a couple of things, Google may catch that. I would would shoot for original content for bith Google and to have people want to come to your site. If you link the two and they are just about the same, most people will not return. The more original the content, the better the site will be.
you can put a link but it will not be considered as a back links. it will be just like an internal link in same domain. If you think this way will create a back link, you are wrong. ^^