There are four operations, but only two underneath. Addition and multiplication are the basic ones, and each lets you reorder and regroup freely. Subtraction and division are rewrites of those two, reached through the opposite and the reciprocal. Here is the whole chapter on a single page, section by section.
That is everything Chapter 1 covers. Exponents, primes, fractions, and algebra all build on these same rules.
QuanticaPrealgebraOpen in the course