Display additional field if a field is checked

Hello,

I don't know if computed field is the good way to do this, maybe you can help me...

What I'm want to do is :

On a node creation form, I want to display an additional field if another field is checked.

For example, for a craftsman :

Field 1 is -> Do you offer tours of the factory? YES /NO

If the answer is YES, display Field 2 -> "Opening hours" etc...

Can I do this with computed fields ? Do you know how ?

Thank you very much.