The directions "right" and "left" form a merism, meaning that the person is not to leave the level path in any direction. Alternate translation: "Walk straight ahead and do not leave the level path" (See: [[rc://en/ta/man/translate/figs-merism]])
Here the word "foot" represents the person who walks. The writer speaks of not committing evil actions as if the person were walking away from evil. Alternate translation: "turn away from evil" or "stay away from evil" (See: [[rc://en/ta/man/translate/figs-synecdoche]] and [[rc://en/ta/man/translate/figs-metaphor]])