Learn Italian: Lui fa una bella passeggiata.

In Italian, the irregular verb fare (to do/make) is used in many set phrases where English uses different verbs. To say "to take a walk," Italians say fare una passeggiata (literally: to make a walk). Since the subject is lui (he), we use the form fa.

Why is the translation "He is taking" when fa is the simple present tense?

Italian often uses the simple present tense (lui fa) for actions happening right now, where English uses the present continuous ("he is taking"). You don't need a complicated "-ing" verb form to express this in Italian!

Why does the adjective bella come before the noun passeggiata? I thought adjectives go after the noun.

While most Italian adjectives come after the noun they describe, a few common ones related to beauty, age, goodness, or size usually come before the noun. Bello (beautiful/nice) is one of these exceptions.

Why is it bella instead of bello?

Adjectives in Italian must match the gender and number of the noun they describe. Since passeggiata (walk) is a feminine singular noun, the adjective changes its ending to match, becoming bella.