What are the four ways to write red in Italian?

You're actually thinking of five ways to write "red" in Italian, not four! Here they are:

1. Rosso: This is the most common and general term for "red."

2. Rossa: This is the feminine form of "rosso," used when referring to a female person or thing.

3. Rossi: This is the plural form of "rosso," used when referring to multiple red items or people.

4. Rosse: This is the plural form of "rossa," used when referring to multiple red female items or people.

5. Rosso acceso: This is a more specific term for "bright red."

It's important to use the correct form of "red" based on the gender and number of the noun it modifies.