When you have reached the point where you feel more or less confident reading, try reading a grammar book in and about the language you are learning. It is not as painful as it sounds and will help you with difficult points. It will be both a review of the basic rules and an introduction to the more subtle aspects of every language. The hindsight will make the basic rules sound more clear and natural and you will be presented with a plethora of model sentences to further reinforce them. You will learn (or just review) the most basic and useful linguistic stuff, e.g.: what is a direct object, an adverb, a nasal consonant, an infinitive, a case, etc. Overall, you will end up with a much clearer and organized picture of the language as a whole.