Generally, the higher the limits are, the more experienced your opponents are. It's only natural to play higher limits as you improve over time, but if you make that transition too fast, it may cost you. If you play poker to win money, you'll have more success playing against people that are less skilled and experienced than you. If you are not winning at the current limit games you are playing, try moving down in limit. The competition will probably be weaker. If you find yourself winning most of the time, try to move up in limit.