Which universities are best for studying Oceanography as an undergrad?
I noticed that there is a push to close the question, and I get why. But I do think that guidance towards a university is still important, even if it does not fit the Earth Science SE guidelines. So here is my answer (as someone who does not study oceanography, rather as a meteorologist): It depends.
What I have found is that the question you should ask is not 'what is the best,' rather 'what is the best for me?' You may want to learn from the best, but you might end up miserable. What can you afford? How far are you willing to travel for your degree? What aspects of oceanography are you interested in -- chemistry, climatology, biology, geology, etc.? Presumably, different universities will emphasize different specialties. Look at what the faculty research, and you will find what
Knowledge is knowledge. With solid reading skill and good resources, you can probably teach yourself enough without needing a degree. If it is just a passion, I would recommend that route. If it is what you want as a career, go to university and get the degree.