'Walk' in the Bible

I considered all the living which walk under the sun, with the second child that shall stand up in his stead.

For what hath the wise more than the fool? what hath the poor, that knoweth to walk before the living?

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