The choice between much and many depends on the noun it is describing.
Much is used to describe mass nouns or noncount nouns like juice, rice, patience, and happiness. When using much, the noun will always be singular; it cannot be plural.
Many is used to describe count nouns or nouns that can be counted like books, ideas, leaves, and shoes. When using many, the noun will always be plural.
- Enseignant: bahaaeddine tabeti