There is currently a discussion on whether university students should spend all their time and attention to studying for a qualification instead of learning about other main subjects.

I genuinely think that spending time learning about other disciplines is (just) as important as studying the main subject at universityone's major.

Adding "just" is optional in this case - your original sentence is correct. Adding it would emphasize your point.

Although many of(taking) thoese classes are not requisitesred to graduate, thesey can provide new ways of thinking that can be beneficial for the major itself.

For instance, my boyfriend, who is a physics student, took some biology classes because he was interested toin learning about that subject.

That is the reason he ended up doing a thesis mixing both subjects, thatwhich contributed to the physics research in his university.

Secondly, learning about other subjects in addition to the main subjectsone's major encourages students to enjoy learning and equips them with knowledge useful for life.

For example, when students learn about finance, they can use this knowledge/understanding to make smart financial decisions.

I would use "knowledge" in this context since it is related to things learned in a class. However, using "understanding" is technically correct in this context.

There is currently a discussion whether university students should spend all their time and attention to(on) studying for a qualification instead of learning about other main subjects.

I genuinely think that spending time learning about other disciplines is as important as studying the main subject at universityyour major.

"your" -> "one's" for a formal tone

Although many of those classes are not requisites to graduate, thesey can provide new ways of thinking that can be beneficial for the major itself.

For instance, my boyfriend who is a physics student took some biology classes because he was interested toin learning about that subject.

That isFor theat reason, he ended up doing a thesis mixing both subjects, thatwhich contributed to the physics research in his university.

When you phrase the sentence like "That is the reason ...", the emphasis is on identifying the reason for the event that comes next, rather than on the event itself.

Secondly, learning about other subjects in addition to the main subjectsone's major encourages students to enjoy learning and equips them with knowledge useful for life.

In conclusion, studying different subjects at university othat are not the main courses of theer than one's major allows students to gain a holistic perspective and use this knowledge in their daily life.

There isare currently a discussions on whether university students should spend all their time and attention toenergy studying for a qualification instead of learn abouting other main subjects.

You don't really spend attention on something.

I genuinely think that spending time learning about other disciplines is just as important as studying the mainfocusing on one's major subjects at university.

Firstly, students who enroll in other classes that are not entirely aligned with their major havegain a more holistic perspective.

Although many of thoese classes are not prerequisites tofor graduateion, thesey can provide new ways of thinking that can be beneficial for the major itself.

For instance, my boyfriend who is a physics student, but he took some biology classes because he was interested toin learning about thate subject.

That is the reason why he ended up dowriting a thesis mixingthat combined both subjects, thatwhich contributed to the physics research in his university.

Secondly, learning about other subjects in addition to the main subjectsyour major encourages students to enjoy learning and equips them with knowledge useful fothat is useful in other areas of their lifeves.

When people take other courses for the pure satisfaction of learning, they getain information more easily and can use ithis knowledge in various areas of their life.

For example, when students learn more about finance, they can use this understandingare better equipped to make smart financial decisions.

When they learn about philosophy, studentsthey can think more critically about the world and the predominant ideas.

What do you mean by "predominant ideas"?

In conclusion, studying different subjects at university that are not the main courses of theoutside of one's major allows students to gain a holistic perspective and use this knowledge in their daily lifeves.