The most significant difference between college and high school is the educational background. In other words, you are going to acquire more profound knowledge at college. Well, it is quite obvious as college is the logical continuation of high school. In case you want to become an expert in the field you are interested in, you will most definitely need to hold a degree in that field. That is the reason why people decide to go to college after finishing high school.
What should also be highlighted in this respect is that college requires you to study more. There will be less classes but it does not mean that you can relax. The amount of tasks you need to complete will get higher. Besides, you will not have a lot of free time. Sometimes it may seem quite overwhelming but it is possible to cope with that load. You just need to come up with a proper plan and to stick to it. What is more, studying at college will get easier after your first year.