Let me be clear that I don't yet have enough expertise to give you detailed advice on language learning in particular. That said, there are strategies for learning in general that apply to learning a new language. One big tip I heard I can't tell you how many times is to vary where and when you study day to day. It turns out that people tend to do better on tests when the testing environment is similar to the learning environment. So, by varying your learning environment, you can keep what you learn from being so dependent on the context of where you learn it. Another thing you can do is try to speak, read, or write in your target language a little bit every day. Repetition is honestly one of the best ways for you to learn anything. To that end, as TheVenerableCain said, duolingo might be a decent place to start. I wouldn't suggest trying to use it to learn a whole language, but it can be a good starting place. Also, it's great if you've learned a language before and want to brush up on the basics.