(idiom) to have achieved nothing; to be a total failure; to get nowhere in one's life or career

it is better to avoid unnecessary trouble or avoid getting involved in others' business to keep things simple

One cannot gain knowledge or wisdom without personal experience; wisdom does not come without experience; you learn by doing.

It is better to avoid starting something new than to deal with the trouble it causes; to avoid meddling or taking on extra responsibilities to stay out of trouble.