In a large skillet, cook the ground beef over medium heat until browned and cooked through, breaking it apart with a spoon as it cooks.
Drain any excess fat from the skillet, then add the taco seasoning mix and water according to the packet instructions. Stir to combine and simmer for 5 minutes.
In a large mixing bowl, combine the shredded lettuce, cherry tomatoes, cheddar cheese, corn kernels, black beans, avocado, black olives, cilantro, and red onion.
Add the cooked ground beef to the bowl and toss everything together until well mixed.
To serve, divide the taco salad mixture among serving plates or bowls. Top each serving with a dollop of salsa and sour cream, and serve with tortilla chips on the side.