Formal:
* Un peu (pronounced "un puh") - This is the most common and neutral way to say "a little".
* Un petit peu (pronounced "un puh tee puh") - This is slightly more emphatic and means "a little bit".
Informal:
* Un chouïa (pronounced "un shoo-yah") - This is a more colloquial way to say "a little" and is often used in spoken French.
* Un tout petit peu (pronounced "un too puh tee puh") - This is even more emphatic than "un petit peu" and means "a very little bit".
Here are some examples of how these phrases can be used in a sentence:
* Je voudrais un peu de sucre, s'il vous plaît. (I would like a little sugar, please.)
* J'ai besoin d'un petit peu d'aide. (I need a little bit of help.)
* Il fait un chouïa chaud aujourd'hui. (It's a little warm today.)
* J'ai dormi un tout petit peu hier soir. (I slept a very little bit last night.)
The best way to choose the right phrase is to consider the context and the level of formality. If you're unsure, "un peu" is always a safe choice.