You may first want to get standardized "at a glance" information from sources that cover all the schools, such as College Board, Merit Aid, US News, Kiplinger. Then you can dig in to each college's individual website for more in-depth information.
The most valuable information the college's website can give you is:
1. Majors and minors by school
2. Specific admission information (i.e., performing arts auditions, test-optional alternatives, early notification programs, honors college and special programs). Supplemental essay information is sometimes available, but often you can only get that through Common Application.
3. Specific financial aid and merit scholarship information and deadlines.
4. College visits (Info sessions and tours, interviews).
5. Student organizations, club & intramural sports, and community service organizations.
There are no tricks to navigating a college website. Some websites are great, some are poor---with no relationship to how good the school is!