Be wise after the event British idiom cliché
Usually used in this form: It's easy to be wise after the event.
To know and understand a situation only when it has already happened
Looking back to our plan, I think we should have made clear the fees, but it's easy to be wise after the event.
Since there has been a dog in my house, I couldn't believe it can cause me so many troubles, but it's easy to be wise after the event.
Completely controlling over a scenario or situation.
The existing situation or condition
Used to talk about a situation which begins to worsen
If you fall for someone's trick the first time then they are at fault.
Are you going to mess with me again? Fool me once, shame on you; fool me twice, shame on me.