My course 6 advisor, Madhu Sudan, actually had a lot of interesting advice about research and theory and practice. Something I hadn't thought about: you can "get your foot in the door" of research by working on extra open problems brought up in class and discussing them with the professor. It's a different kind of research experience than UROP, which he implied was more on the applied end of things (which I agree with for the most part) and undoubtedly would require a time investment. There was more to it that I don't remember at the moment.
Mostly, I'm afraid that these wisdoms will slip out of my consciousness, which is why I journal them. But isn't this the whole purpose of writing? The hope that the medium which preserves your thoughts will outlive or outperform the storytellers of oral tradition?