The Art of Electronics, by Horowitz and Hill, is aimed at a university or professional audience, but could also be an incredible learning resource for a younger student (or older hobbyist!) interested in learning more about the field.

Speaking for myself, I would have loved to read something like this when I was first experimenting with electronics as a child. A lot of the details would have gone over my head, but even just knowing the general outlines of the topics it covered would have been a huge step up.