Start by setting up a large pot with water and salt - bring to a boil.
Peel the potatoes and carrots - cut the potatoes to a large dice and the carrots to a small dice (this way you can cook them in the same pot and they'll cook at the same time!)
Cook the potatoes and carrots until tender, drain and lay on sheet tray. Instantly drizzle with vinegar and salt, let cool.
Cook the eggs to hard boil - start eggs in cold water, bring to a boil, turn heat off, cover and set timer for 12 minutes and you have perfect eggs! Chop the eggs and chill.
Combine the potatoes, carrots, and eggs with mayonnaise, taste to re-season. You might need to add more vinegar and salt depending on your preferences.