College classes fall into three main buckets: general education courses that every student takes, major-specific courses in your chosen field, and electives you pick based on your own interests. A bachelor’s degree typically requires about 120 credit hours, which works out to roughly 40 individual courses spread across four years. An associate degree requires about 60 credits, or around 20 courses. How those courses break down depends on your school and your major, but the overall structure is remarkably consistent across most colleges and universities.
General Education Courses
General education, often called “gen ed” or “core curriculum,” is the set of broad introductory courses every student must complete regardless of major. These classes are designed to give you a well-rounded foundation in multiple disciplines before you specialize. A bachelor’s degree typically requires around 30 credits of general education, while an associate degree usually requires about 15.
The specific subjects vary by school, but most gen ed programs pull from the same core areas:
- English composition and writing: Usually one or two semesters focused on essay writing, research skills, and argumentation.
- Mathematics: Often college algebra, statistics, or a quantitative reasoning course, depending on your major track.
- Natural sciences: Introductory biology, chemistry, physics, or earth science, frequently paired with a lab component.
- Social sciences: Psychology, sociology, economics, or political science.
- Humanities: Philosophy, literature, art history, religious studies, or similar courses that explore human culture and thought.
- History: Often a survey of U.S. or world history.
- Communication: Public speaking or interpersonal communication.
Many colleges have also started requiring courses in health and wellness, physical education, or diversity and inclusion as part of the gen ed package. You will typically complete most of your gen ed requirements during your freshman and sophomore years, which is why those first semesters can feel like a sampler platter of unrelated subjects. That variety is intentional. These courses build skills like analytical writing, quantitative reasoning, and critical thinking that carry into every major.
Major-Specific Courses
Your major is the subject area you specialize in, and it comes with its own required course sequence. Major requirements usually account for 30 to 60 credits of your degree, depending on the field. A nursing or engineering major, for example, tends to have a heavier course load than an English or communications major, leaving less room for electives.
Major courses are where you move from broad introductions to focused, in-depth study. If you major in psychology, your required courses might include developmental psychology, abnormal psychology, research methods, and statistics for the behavioral sciences. A business major might take financial accounting, marketing principles, organizational behavior, and business law. Each major has a set curriculum laid out in the college catalog, often with a recommended sequence so you take foundational courses before more advanced ones.
Some majors also require a capstone experience during your senior year. This could be a research project, a thesis paper, a portfolio, or a practicum where you apply what you have learned in a real-world setting. Many programs also offer concentrations or specializations within the major, letting you tailor your coursework further. A computer science major might concentrate in cybersecurity or artificial intelligence, for instance.
Elective Courses
Electives are any courses that do not count toward your gen ed requirements or your major. They fill the remaining credits needed to reach your degree total. Most students need at least a few elective courses to graduate, and some degree plans leave room for a dozen or more.
This is your most flexible territory. You can use electives to explore subjects you are curious about, like astronomy or creative writing, or you can use them strategically to build skills that complement your major. A marketing major might take a web design elective. A pre-med biology student might take a medical ethics course. Many students also use elective credits to pursue a minor, which is a secondary area of study requiring a smaller set of courses (typically five to seven) in a single discipline.
How Course Levels Work
College courses are numbered to indicate their difficulty and where they fit in your academic progression. Understanding the numbering system helps you plan your schedule and avoid signing up for something you are not ready for.
Lower-division courses, typically numbered in the 100s and 200s, are introductory classes taken mostly by freshmen and sophomores. These cover foundational concepts and tend to be larger lecture-style classes, sometimes with hundreds of students. The teaching style is usually structured closely around a textbook and syllabus, with clear expectations for each class session. Courses like English Composition I, Introduction to Sociology, and College Algebra fall here.
Upper-division courses, numbered in the 300s and 400s, are more advanced and usually reserved for juniors and seniors. These classes dig deeper into specialized topics within your major and often have a different feel. Class sizes are smaller. Instead of straight lectures, you might participate in seminar-style discussions, collaborative projects, or independent research. A 400-level course is typically the most advanced undergraduate work you can do, sometimes involving a capstone project or preparation for graduate study.
The connection between these levels matters for planning: lower-division courses often serve as prerequisites for upper-division ones. You must pass Introduction to Psychology (a 100-level course) before you can enroll in Cognitive Psychology (a 300-level course). Skipping ahead is rarely an option, so falling behind in prerequisite courses can delay your entire schedule.
What a Typical Four-Year Schedule Looks Like
Most full-time students take four to six courses per semester, totaling around 15 credit hours. Here is a rough sketch of how your course load shifts over time:
During your freshman year, your schedule is dominated by gen ed courses. You might take English composition, a math class, an introductory science with a lab, a history survey, and perhaps one introductory course in the field you plan to major in. Sophomore year continues filling in gen ed requirements while layering in more courses within your major. This is also when many students formally declare their major if they have not already.
Junior and senior years look noticeably different. Gen ed requirements are mostly finished, and your schedule fills with upper-division major courses, electives, and possibly minor courses. Class sizes shrink, readings get denser, and assignments shift from exams toward papers, presentations, and projects. By senior year, you may be doing a capstone, an internship for credit, or independent study with a professor.
Choosing Classes That Fit Your Goals
Every college publishes a degree plan or curriculum map for each major, spelling out exactly which courses you need and in what order. Your academic advisor can help you map these out semester by semester, but it is worth understanding the structure yourself so you can make informed choices early.
Register for gen ed courses that double-count whenever possible. Some schools allow a single course to satisfy both a gen ed requirement and a major requirement, which frees up room in your schedule for electives or a minor. Pay close attention to prerequisite chains in your major so you do not end up needing a course that is only offered once a year and you missed the window.
If you are undecided on a major, the gen ed system actually works in your favor. Spending your first two semesters on general education courses lets you sample multiple disciplines without falling behind. A student who switches majors after completing most gen ed work loses far less time than one who has to start a new major-specific sequence from scratch.