What does … mean in Russian

What does какова means and how to use it and what is the difference between it and какого?

What does the word счёт mean?

What does то means, and how to understand the words that come with то Like Вообще то или почему то

What does the word чего means

Hi. I would like to know the meaning of this verb "успеть"...? It's part of a song, which goes like this: Нам не успеть...