Yes failure is always the best teacher, better than any advice anybody could give you. Sometimes we don’t learn from our mistakes as humans, but that’s normal. Keep repeating the same mistakes over and over and over is not normal after you learn them already, but it happens. Failure is how you learn; failure is part of success. You have to fail at something to becoming better at it, because we dont know everything as humans. There no success story in life without failure. Its a journey !