The path tool allows you to see the ideal paths that workers will take from their homes to their workplaces, or from workplaces to homes. Once the path tool is selected, simply click on a home or workplace to show the paths that workers will take.
Because workers need to periodically return home to eat and get warm in the winter, it's generally better to have short paths from homes to workplaces, wince the workers will spend more time working than walking, which will result in higher resource production.
If you find workers taking long paths, you can try to build more homes near the work places. After a while, the workers will move into the new homes, or swap jobs with their neighbors to minimize the distance from their home to their workplace.