<p>You will have to complete a certain number of courses for your major. Some of those will probably be specified: you have no choice about those. Others will probably ones you can choose from a group of courses, any of which will do as long as you take enough. You're going to worry about these after you choose a major.</p>
<p>Same thing for your school. Those are the ones people are talking about when they say "gen-ed." There may be different sets of requirements depending on your general area: science majors may have a different set of gen-ed requirements than liberal arts majors. For the first semester it is a good idea to take a look at the gen-ed requirements for any major you think might be interesting, and start out with courses that will probably be useful in any of those areas plus introductory courses in the fields you're considering. A lot of times those two overlap: you can try out fields that look interesting, knowing that if you don't end up in those departments you can use the courses toward your gen-ed requirements.</p>
<p>The information about what various majors' requiremenst are will probably be on your school's website (often under "Current Students" rather than "Prospective Students"), so you don't have to wait until you arrive on campus to start figuring this out.</p>
<p>You will also have to complete a certain number of credits in all, and even after meeting those two sets of requirements you may still have to choose courses that interest you.</p>
<p>There are two factors that you have to consider when it comes to making a choice of major in time to get out on your schedule: the system of prerequisites and the system of course scheduling. If you have to take course A for your major, and course B is a prerequisite for A, and course C is a prerequisite for B, then you're going to have to know that you need A in time to get C and then B and then A. Also, while the big survey courses that satisfy gen-ed requirements are likely to be offered every semester (at a large school there may be multiple sections every semester), the courses that are designed for majors aren't always offered that quickly. If a course is offered every fall, and at no other time, then you're going to have to know that you need that course by the start of your last academic year in school. If a course is offered once every two years, you may need to know you have to take that course by the start of your junior year.</p>
<p>So when you pick a school you should take a look at the requirements for all the majors that interest you to see how many semesters -- minimum -- you'll need to spend working toward that major. Then if you find other majors that look interesting, you should take a look at those. When you know what you're serious about, you can contact the departments to ask them about things you wouldn't necessarily know about, such as how often a given course is likely to be offered.</p>
<p>Now, you can also take courses in the summer, so if you need a particular prerequisite you can pick up a class then. Of course, fewer classes are offered in the summer, so you're better off taking something at the start of the chain of prerequisites than waiting until later. You can also "overload" yourself by taking, in a single semester, more than 1/8 of the total credits needed to graduate, if by some chance you've suddenly decided to change your major to one where you'll need more credits than the college or university requires, in order to complete the major. So you've probably got more flexibility than you would think.</p>
<p>Does this help?</p>