I think the key is always to try and understand the motivation behind that behaviour. If not, it will happen again and again.

I will politely try to make him confess but would then also understand on what is the reason to lie and then act accordingly

I will ask my kid why did they lie and teach them the consequences. Let them know what their actions can lead to.

I will inform you I rather he tells the truth and understand why he did what he did

Understand why first and make them know that it hurts me to see them lie

she always does, and i know she is lying because she is smiling

But there will be a corresponding punishment that goes with it

Scolding is never a good way to understand why they’ll lie

I will ensure he understands the repercussions of lying...

Discipline and find out why they felt the need to lie