Here are some of the most common meanings:
Pronoun:
* What: "Que veux-tu?" (What do you want?)
* That: "Je sais que tu es là." (I know that you are there.)
* Which: "Quel est le livre que tu préfères?" (Which book do you prefer?)
Conjunction:
* That: "Je crois que tu as raison." (I believe that you are right.)
* Because: "Je suis fatigué, que j'ai travaillé toute la journée." (I am tired, because I worked all day.)
* So that: "Je mange, que je puisse avoir de l'énergie." (I eat, so that I can have energy.)
Adjective:
* What: "Quel que soit le résultat, je suis heureux." (Whatever the result, I am happy.)
Adverb:
* How: "Que c'est beau!" (How beautiful it is!)
Other Uses:
* Interrogative word: "Que dites-vous?" (What do you say?)
* Emphasis: "Que c'est bon!" (How good it is!)
It's important to consider the context to determine the meaning of "que" in a specific sentence.