As a high school student, I enjoy studying mathematics on my spare time. Having recently worked through a textbook on vector calculus, I am in need of a textbook that will give me a solid introduction to differential equations. Any suggestions will help my search; however, I would prefer a book that will give me a good intuitive understanding of topics, rather than a highly rigorous book. Also, I suspect it will help narrow down your suggestions if I give you a list of topics I am familiar with. I am competent in elementary calculus, I have a decent understanding of multivariable/vector calculus and I have some knowledge of linear algebra. If you know of any textbook that will aid my studies I would greatly appreciate it if you shared the title and author (also, why it would be a good book, if you feel so inclined).