Schey's book is probably the best book to start learning vector calculus from. The intuition he provides for operators like grad, curl, div is incomparable. I had done many courses on field theory, EM waves, and vector calculus before stumbling up on this book. This book re-taught me all the concepts in a perfect way which no other teacher had done previously. Strongly recommended for undergrad/grad students who have even a small inclination towards digging deep into the operators listed in the title.