'Walk' in the Bible

I saw all the living who walk under the sun, that they were with the youth, the other, who succeeded him.

For what advantage has the wise more than the fool? What has the poor man, that knows how to walk before the living?

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