Any fool can/could…

Pro Tip 1/3

Ease emphasis

Use the phrase to stress that something is very easy or obvious, even for someone with no expertise.

Any fool could operate this machine; it's so simple.

Pro Tip 2/3

Sarcasm tool

The phrase might carry a tone of sarcasm, implying the other party is missing something obvious.

Any fool can see that won't work. Why can't you?

Pro Tip 3/3

Understatement

Sometimes used to understate the intelligence required, suggesting the task is simpler than it appears.

Any fool could learn these rules, but mastering them is another story.