It's a question that asks if someone has the ability to perform a specific action.
Here's a breakdown:
* Sais-tu: This is the informal way to say "Do you know?"
* Faire: This means "to do"
To use it in a sentence, you would add the action after "faire":
* Sais-tu faire du vélo? (Do you know how to ride a bike?)
* Sais-tu faire la cuisine? (Do you know how to cook?)
* Sais-tu faire un gâteau? (Do you know how to bake a cake?)
The phrase "Sais-tu faire" is commonly used in casual conversation and implies that the speaker is curious about the other person's skillset.