Learn French: On trouve de beaux présages dans la nature.

This is the rule of plural article reduction! When a plural adjective comes before a plural noun, the plural indefinite article des changes to de. Since the adjective beaux comes before the noun présages, des becomes de.

Why does beaux come before the noun présages here?

While most French adjectives come after the noun, a specific group of short, common adjectives goes before it. You can remember them with the acronym BAGS: Beauty, Age, Goodness, and Size. Beau (beautiful) falls perfectly into the Beauty category.

The translation says "nature," so why does the French sentence use la nature with the article?

In English, we usually drop the article "the" when talking about general concepts or abstract nouns (like nature, love, or time). In French, you must keep the definite article (le, la, or les) when talking about things in a general sense.

I've learned that on means "one". Why is it translated as "we find" here?