Bello vs. bellissimo
In Italian, both bello and bellissimo are used to describe beauty, but they differ in intensity and usage.
Bello
A1Bello is the standard adjective for beautiful or handsome in Italian. It's commonly used and can describe a wide range of attractive things or people.
Che bel vestito!
(What a beautiful dress!)
Marco è un ragazzo molto bello.
(Marco is a very handsome boy.)
Oggi è una bella giornata.
(Today is a beautiful day.)
Bellissimo
A2Bellissimo is the superlative form of bello, meaning very beautiful or most beautiful. It's used to express an extreme or exceptional level of beauty.
Il panorama dalle Alpi è bellissimo!
(The view from the Alps is absolutely beautiful!)
Hai visto quel quadro? È bellissimo!
(Have you seen that painting? It's gorgeous!)
La Fontana di Trevi è bellissima di notte.
(The Trevi Fountain is stunning at night.)
Summary
While bello is used for general descriptions of beauty, bellissimo emphasizes exceptional or extraordinary beauty. Bello is more versatile and common in everyday speech, whereas bellissimo is reserved for expressing strong admiration or awe.