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teach (one's) grandmother to suck eggs

Translations

учить (кого-то) бабушку яйцам учить (не учи учёного)

You don't need to show him how to use the computer; it's like teaching your grandmother to suck eggs.

Тебе не нужно показывать ему, как пользоваться компьютером; это как учить бабушку яйцам учить.

Definitions

To presume to teach someone something they already know very well, often someone who is much more experienced; to offer advice or instruction to an expert in a condescending or unnecessary way.