Learn Spanish (Latin America): Los directores no confían en el asistente nuevo. - The directors do not trust the new assistant.

In Spanish, the verb confiar (to trust) is almost always followed by the preposition en. You are literally saying that you "trust in" someone. This is a great habit to build, especially for this lesson—if you wanted to say "the assistant whom they trust," you would carry that en over and say, "el asistente en quien confían."

Can asistente be a feminine word, or does it only end in -e?

The noun asistente is gender-neutral and always ends in -e. To show the gender of the person, you just change the article in front of it. Here it's el asistente (male assistant), but for a female assistant, it would be la asistente.

Why does nuevo come after asistente instead of before it?

In Spanish, descriptive adjectives usually go after the noun. Saying el asistente nuevo (the assistant new) is the standard way to emphasize the objective fact that this person is newly hired or new to the role.

How do you make words like director plural?

For nouns that end in a consonant like -r, you make them plural by adding -es. That is why director becomes directores.