Maybe someone from a degree like science/arts/commerce where most people do different subjects should chime in
I'm not sure if science - global challenges counts since you bond with other gc-ers incredibly quickly but 3/4 of my units are normal science so I'll speak from that. Some lecturers want you to make friends in the lectures (in my experience more common in maths than anything else) and if so ask the people near you what units they're studying. If they're doing any units you also study (this is likely) and you get along you can become lecture-buddies (usually you don't say "let's be lecture buddies" it just becomes a thing) for those units. Basically this means you sit next to eachother for those lectures and chat in the few minutes before it starts, on your way to your next class etc. If you become lecture-buddies with someone who is socially connected you may be adopted into a larger friendship group. Usually you want to say something as soon as the lecture finishes to your lecture buddies & this can lead to you having convos outside of class too.
Tutes & labs (as mentioned above) are great places to make friends. It's generally a good idea to add lab partners on social media so that you can talk about the unit together. This also facilitates convos outside of class which is pretty important for being friends with someone.
Clubs & socities can be used to make friends and this is especially likely if you join a committee and/or turn up to events and talk to people frequently.
Lots of people in science units aren't studying "bachelor of science" so feel free to talk to them about their non-science uni stuff too! Pragmatically, this helps you expand your horizons and learn about potential electives; socially, people are usually more engaging and engaged when talking about something they're passionate about. You'll probably encounter a much greater diversity of people in uni than highschool & being interested in their perspectives and why they have them will add richness to your understanding + make it easier for you to find friends.
Hope this advice helps, best of luck!