Here the word "foot" represents the person who is walking. The writer speaks of a person's actions as if he were walking along a path, and of planning those actions carefully as if it were making that path level. AT: "Make a level path to walk on" or "Prepare well what you want to do" (See: [[rc://en/ta/man/translate/figs-synecdoche]] and [[rc://en/ta/man/translate/figs-metaphor]])
The writer speaks of a person's actions as if the person were walking along a path and of those actions being successful as if the path were safe and secure. AT: "then everything that you do will be right" (See: [[rc://en/ta/man/translate/figs-metaphor]])