Hello
I like your question - it's an interesting one, something I haven't seen a lot of whilst using The Student Room. People are always interested in the social side as oppose to what other students have learned in order to make the most of their time at university.
Well, I've just finished my second year and I'm now going into my third. In my first two years, I've learned the following;
Never be afraid to ask for help! Yes, university is about independent learning and learning how you work best but if you are struggling or don't understand something, seek help!
Which leads me onto...
Support! There is a lot of support at university, from your lecturers to internal services that can help with assignment work and such. These are there everyday and even through holidays - use them! If you don't understand feedback, seek support.
Always make the effort to catch up if you have a day off sick! You should make friends pretty quickly - make sure they take notes when you're sick or ask the lecturer for the presentations or notes they used or if there is anything you can use to read up on.
Enjoy the experience! University has times where it is extremely stressful or you'll have lectures where you sit there and question if it's really what you want to do but stick with it and enjoy every little moment! From the fun lectures to the boring ones and everything in between - you'll make some good memories and learn a lot!
Try and put what you learn into practice - be that teaching experience, or writing up your own projects to share with people and so on and so fourth. Don't learn it in a day, write it down and be done with it - continually renew your knowledge on it!
Don't lose the passion for your course. Keep that passion strong - read for the hell of it even if it's not something you need to read for the course because you may end up learning something that you may not and that can help towards a lot more on your course.
There are probably more I can share but this is probably enough for now!
Hope this sheds a little light on things for you!
Enjoy