Answer: A reputable website is one that possesses authentic and credible information that can be easily relied upon. For instance, all official government websites are reputable.
Example- www.csirhrdg.res.in is a reputable website of CSIR ( counsil of scientific and industrial research) India. It is one of the premier national and world's largest publically funded resource and development organization.
Well, almost any website can be, but if you are meaning for money, then google. if you are meaning reliable, then look for something with .org, its history and stuff