'Walk' in the Bible

I saw all the living that walk under the sun, with the child, the second, that should stand up in his stead.

For what advantage hath the wise above the fool? what hath the poor, that knoweth to walk before the living?

Rejoice, young man, in thy youth; and let thy heart cheer thee in the days of thy youth, and walk in the ways of thy heart, and in the sight of thine eyes; but know that for all these things God will bring thee into judgment.