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You don't learn something for the purpose of learning it. If you don't have a purpose for which you want to learn PAWN, you will have no motivation and will probably spend less than an hour every month. Just have an idea, why you want to learn PAWN? Do you want to make a SA-MP server or your own game mode? You should ask yourself these questions and take the decision. Once you take the decision, you will find yourself trying to learn the language just to apply your ideas by yourself. Then you will do mistakes and will seek others' help to fix what you've done wrongly, and others will help you improve your code. Then you'll not do these mistakes in the future, and you will gradually start helping others out yourself once you've learnt enough. But nothing stops you from learning more. You will probably have interest in learning other languages once you've mastered PAWN.