Don't presume to give advice to those who are more experienced.

One doesn't require an expert to tell one what one already knows.

Indicates that the speaker is unable to speak the English language.

(idiomatic, vulgar) One should not cause trouble in a place, group, or situation in which one regularly finds oneself, as it will likely backfire

(aphorism, humorous) The stereotypical man does not do things that are considered effeminate.

(idiomatic) Used as a mockery to someone who is about to be or should be confined in prison.

Alternative spelling of don'tcha

Leave something alone; avoid attempting to correct, fix, or improve what is already sufficient (often with an implication that the attempted improvement is risky and might backfire).