Many on this thread (or their kids) seem to be attending an LAC or LAC-bound. LACs are supposedly attractive to those students who are undecided. For majors where specialization is important, LACs may not be the most suitable, unless the student is going to pursue a more advanced degree elsewhere. The courses offered tend to be more generic, even in a specialty. There’s nothing wrong to be trained as a generalist. The only problem is when there’re too many generalists.
A1: Checks to see if the intended or (for undecided students) possible majors are offered (and possibly checking for external accreditation when applicable to the major). Probably about as far as most people on these forums get in this area.
Even if a particular major is offered, the full set of requirements and more advanced options aren’t the same among the colleges. Many colleges only satisfy the most basic requirements for a degree in that major.
A2: Checks curricular organization and required and elective upper level offerings in the intended or possible majors (may require assistance from someone knowledgeable in the field). May check for secondary admission or progression barriers (commonly overlooked, sometimes a surprise later when the student is denied entrance to or forced out of the major for not meeting a 3.5 or whatever college GPA after a year).
It shouldn’t be beyond the capabilities of the student and/or his/her parents to read the college’s catalog (or its online equivalent) from cover to cover (including the general requirement, major-specific requirements for all possible majors the student may be interested in, all the courses for those majors and their prerequisites) before committing to the college. When the student is already on campus and relies solely on his/her advisor, it’s sometimes too late.
A3: Checks depth of content of specific courses, as you suggest doing. Rarely done by posters on these forums. Often, this information is difficult to access (and evaluation usually does require someone knowledgeable in the field).
The student could use forums like CC for this purpose (or consult some specialist privately).
Alongside, there is occasionally consideration of general education requirements at each college. But perhaps not often, since we see a lists that include both (for example) Brown and Harvey Mudd.
Those students probably only care about the prestige factor, or some ranking. They’re more likely to regret their choices either at college decision time or later in college.