I have only abstract advice, but it's important advice. The thing that a lot of people miss when choosing a topic is that it has to be not just something that

I have only abstract advice, but it's important advice. The thing that a lot of people miss when choosing a topic is that it has to be not just something that you're excited about working on but also something that you love reading about. Because situating your work in terms of the existing literature is a very large part of a research degree (and also will help you do good work, presumably).