This is mainly geared at TypeC members who are still in high school or in their first year at university.
Understand that university lecturers will always tell you that their courses have practical applications, as it is in their interests to do this. Success stories abound on leaflets. The reality, however, is that some courses are far better investments of time, energy and of course, money, than others are. My situation is a bit unusual because I am accruing income from trusts, investments and some part time work, and have hardly any debt, but even I have made some bad decisions with arts papers. Composition for example is something I think it is better to do in my spare time, as only the basic theory can be taught at university - the rest depends on raw talent and using it.
With online resources now available in many subjects for a fraction of the cost of attending a university, I don't see the need for people to attend many university courses anymore unless they are planning on entering the boring, stifling and self-censoring environment of academia. Subjects like politics and history are best just to read about in your spare time.
Here is an article by Forbes looking at the ten worst college majors The 10 Worst College Majors - Forbes. Compare that list with the one of fifteen most valuable ones The 15 Most Valuable College Majors - Forbes.
The top 10 best, in order:
1. Biomedical Engineering
3. Computer Science
4. Software Engineering
5. Environmental Engineering
6. Civil Engineering
8. Management Information Systems
9. Petroleum Engineering
10. Applied Mathematics
Do not be fooled into thinking that this just applies to the US, either. It doesn't.
N.B. I wish I didn't have to make it explicit, but this is a serious thread. If you don't have something constructive to add just lurk in the shadows. You will be doing everybody a favour.