Adverbs fácil and difícil
fácil - easy
difícil - difficult
Cocinar pasta es muy fácil. (Cooking pasta is very easy.)
Aprender un nuevo idioma es difícil. (Learning a new language is difficult.)
Progress, Vol. 3
Progress, all volumes
Desirable difficulties
If studying feels effortless, you're probably not learning much. A bit of struggle during practice is a good sign. Difficulty isn't the enemy of learning; it's the mechanism.