Which sentence is correct?

Los mapas son pequenas
El mapa es pequeno
La mapa es pequena
Las mapas son pequenas

If you know, can you explain the rule for how to decide. thank you

Choose the correct use of the spanish preposition para in the following sentence. para aprender un idioma bien, hay que practicar fuera del salón de clases. "in order to," followed by an infinitive "to," referring to a destination "by," referring to a deadline intended for a goal or destination

What does “lara y cailan son mejores amigas” mean is spanish?

The teacher didn't explain this at all and i don't understand this