This is the 114th most frequent Spanish word.
cosas
"Things"
In this sentence, 'cosas' refers to general items or goods available in the store.
Las cosas en la tienda están en oferta.
The things in the store are on sale.
Here, 'cosas' indicates concepts or aspects to be learned, used in a more abstract sense.
Siempre hay cosas que aprender al estudiar un idioma.
There are always things to learn when studying a language.
In this example, 'cosas' refers to personal belongings or items owned by someone.