Having to assume a timeframe, I do not think you have actually learned the languages. It usually takes years to be really good with one. That is not to say you

Having to assume a timeframe, I do not think you have actually learned the languages. It usually takes years to be really good with one. That is not to say you have learned nothing (exposure to many paradigms is good), but that it takes a lot of effort, may be confusing and that you would probably be better-served by concentrating on one or two and working on actually programming first. The dual nature of languages is that they are nontrivial (at the "mastery" level) and they can profoundly affect how you program but that at the same the specific one you end up using is kind of immaterial to programming which is to say composing logic into a functioning program. All of that is a long-winded way of introducing the suggestion that you learn to program by programming. The second-best is understanding others' programs (select well-respected, progressively larger codebases). Books, suggestions of which I hope others will provide, may give you some good ideas and thought patterns. "Software design" is a vast field with tons of completely obsolete advice, and terrible amounts of overengineering. Perhaps something like an agile workflow book, "The Pragmatic Programmer" once you can construct programs.