Spanish language Q&A Forum

I´ve just learned that I can use qué+ser to definite a meaning of what is it.

Why the sentence doesn´t add ser? Thanks.

¿________ significa "presumido"?

We need to be careful while translating a very single word.  About the word "cayos", if we put it in Google Translate, the translation is "key". But in context, it has a different meaning. So, there is no mistake in the word "cayos" in the text. It's a small island.

Buena lectura para obtener nuevo vocabulario.

I never thought that I was misusing definite articles until this exercise.  Apparently, I either add a definitive article when it's not required or omit it when it is.  Is there a rule that I'm missing with this?

For example: For "Asimismo, gobiernos y organizaciones trabajan en políticas para una gestión sostenible del agua.", I wrote: "Asimismo, LOS gobiernos y organizaciones trabajan en LAS políticas para una gestión sostenible del agua".  Why shouldn't I use definite articles where I did?

This is the first one I have failed over and over, and over again.  There is just not enough direction here to understand the differences.  Is there a source you would recommend that discusses this in more detail?