If you want to talk about hindsight in Italian, you can't really use your intuition.

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English uses the verb "to see," "to look back." Italian uses the noun senno (wisdom, good judgment, common sense) a not-so-common word outside of expressions such as the present one. It also uses poi, which as an adverb means "then" or "after" and as a noun means "the future," or "the hereafter." So we're talking about wisdom after the fact. 

Consider this dialog between Dante and Eva from a recent episode of La Ladra.

Ma ragiona. Che cosa potevo fare, eh?

But just think. What could I have done, huh?

Sceglierti meglio la fidanzata.

Choose a better girlfriend.

È facile parlare col senno del poi, ma io non avevo...

It's easy to speak [judge] with hindsight, but I hadn't...

Captions 22-25, La Ladra - Ep. 3 - L'oro dello squalo - Part 10

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There's a proverb:

Del senno di poi son piene le fosse 
Graves are full of hindsight.
Hindsight has 20/20 vision.

Note that the Italian expression uses the preposition con (with) plus the article il (the): col = con il. Col senno di/del poi (with the wisdom of what happens afterward). In English, we usually say "in retrospect," and "in hindsight," or "with [the benefit of] hindsight."

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Col senno del poi is an expression we hear often in Italian, but it's just quirky enough that it's hard to guess its intuitively. Senno is a noun we rarely hear. That's why this lesson happened. Now you know!