This depends more on you and your degree. Generally, 5 classes is manageable if you don't have other commitments such as a big role in a club, a part-time job, or athletics.

Some people find there is a big difference between 4 classes and 5 classes. 4 classes are typically seen as more manageable. However, don't be afraid to take 5. Just be sure to plan ahead.

If the schedule builder gives you a warning, it's probably a good idea to listen. However, if it doesn't, you should be fine. Be aware that classes are packed on the first few days of the semester, so it may take longer to get to your next class.

If you're taking 3 classes, sure. But taking 4 classes in 1 day is a lot. You might get burnt out fast, so try to spread out your classes a bit so you can spend less time on campus per day. Some days, even 1 class feels like 3.

If you have 2 classes that day, it's probably not necessary. But 3 back-to-back-to-back classes is a heavy load. Mental fatigue will almost certainly set in. Set some time aside to have a snack or socialize.

This shouldn't be too much of an issue if you're in your first year unless your admission was very late. Don't panic, you have at least 3 more years to get the classes you need. If it's a mandatory class, reach out to advising and they can potentially overload the course.

Don't forget that nearly everyone feels overwhelmed at first. University is nothing like high school in most cases. Be sure to do things you enjoy and take time off. Create a realistic schedule and establish a routine.