Remember, programming languages are a tool and problem solving is a skill. Learn data structures and algorithms. There are plenty of good books and websites out there on those topics. Once you have a basic understanding of those you can learn to apply your language of choice to implement solutions to problems. Next, find problem and solve. Also, some languages lend themselves to solving certain problems better than others. Don't limit yourself to one language. Once you have the knowledge of one language you are only a different syntax away from the next. Logic does not change, problems do.