General "all":
* ʻĀpau: This is the most common and general way to say "all".
* A pau: Another common option, with a slightly different pronunciation.
"All of":
* ʻĀpau o: This is used when you want to say "all of something".
* A pau o: Another way to say "all of something".
Example sentences:
* ʻĀpau mākou i hele: We all went.
* ʻĀpau o nā meaʻai: All of the food.
You can choose the best phrase for the specific context you're using it in.