In addition to career-specific websites, there are numerous reputable and reliable websites that provide career information and guidance. Below are some that provide comprehensive career information.
Most career fields have professional organinzations that provide a wealth of career information for you as a students. These vary and can often be found by doing a simple Google Search.
(An example would be to search for librarian careers. I would use key words that include: librarian, library, career, association.)