Neither me nor DH went to uni, in fact none of our immediate family went to uni, our DS is the first in our family.
I agree with the school/teacher sometimes not giving good advice. I remember meeting our son's sixth form tutor to discuss uni applications etc and I'd done some research about Uni league tables, subjects that lead to good careers, unis with good relationships with big employers, etc., and had already done some Uni open days, and she just brushed all that aside and told DS he should choose a subject he loves and choose the uni he loves and not to worry about jobs/careers! Utterly baffling advice, and we quickly told DS to forget what she said!
Because we'd had no Uni experiences to call on, we decided to take DS to open days a year early, to a few of our closest. DS wasn't planning to go to them (but was open), and had no clue about what subject he wanted to take, or even whether he wanted to go at all. We just used those open days as a "starting point" for all three of us to learn about Unis and they were very enlightening, we sat through various "talks" at each, on subjects such as student finance, accommodation options, and a few random subject talks, and talked to students who were giving campus, lab and/or accommodation tours. After those we were a lot more clued up about the whole thing. It was all overwhelming at first, but all three of us soon started to better understand the process, the reality of student life, what different unis could offer in terms of careers advice, different module options, "joint" subjects etc etc.
The following year, we could then do the open days of unis he was actually interested in going to, and subject talks he was interested in taking, and having done all the "basic/generic" stuff the year earlier, we could get straight in to the detail. DS soon made his decisions about subject and preferences for uni. When he filled in his UCAS application form, his sixth form tutor was aghast and tried to get him to change his mind on both subject and Unis as she had her own ideas - he held his nerve much to her annoyance. It all worked out perfectly - the Uni was right for him, the subject was right, and he now has a very good job/career/profession starting work literally as soon as Uni finished on a top UK firm's graduate scheme.