Learn Hardcore Spanish (Spain): Mi padre dice que ser ambicioso no es un defecto, siempre que también seas generosa con tu tiempo. - My father says that being ambitious is not a flaw, as long as you are also generous with your time.

Breakdown of Mi padre dice que ser ambicioso no es un defecto, siempre que también seas generosa con tu tiempo.

What does que do after dice?

Here que means that and introduces the next clause:

Mi padre dice que... = My father says that...

In English, that is often optional, but in Spanish que is normally kept.

Why is there no tú before seas?

Spanish often leaves out subject pronouns because the verb ending already shows who the subject is.

Seas is the tú form of the present subjunctive of ser, so tú is understood automatically.

So:

...siempre que también seas generosa...
means
...as long as you are also generous...

Adding tú would only be for extra emphasis or contrast.

Why does Spanish use ser ambicioso instead of a noun like la ambición?

Spanish often uses an infinitive as a noun-like idea.

So ser ambicioso means being ambitious or to be ambitious in a general sense.

This whole infinitive phrase acts as the subject of the sentence:

Ser ambicioso no es un defecto = Being ambitious is not a flaw

This is very common in Spanish: