How to use *todo*

I am self-studying Spanish, so let me ask you Spanish speakers questions here. One of my new vocab today is *todo*. On the dictionary, I see some example sentences, and I assume that if the nouns after the word *todo* is countable, it is *todos*, and if it is uncountable, it is *todo*. Is what I am understanding correct?


todos las mujeres

toda la noche

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