Etale cohomology is an important branch in arithmetic geometry. This
book covers the main materials in SGA 1, SGA 4, SGA 4 1/2 and SGA 5 on
etale cohomology theory, which includes decent theory, etale fundamental
groups, Galois cohomology, etale cohomology, derived categories, base
change theorems, duality, and ℓ-adic cohomology. The prerequisites for
reading this book are basic algebraic geometry and advanced commutative
algebra.