Don't try to find out the best way to learn English. Everyday and every time where it's available, you just have to listen English natives speaking and read good English books. Then, unknowingly, someday, you get to be able to speak and write in English. You have to remember that this Language came first before people analyze it and construct a system called 'Grammar'. No people who could speak their mother tongue and never went to school studied Grammar. But, they could use their own language without much problem. But, as a non-native learner of English, when you learn English in your later stage of development of language learning, you want to learn how they work systematically. So, it's quite up to you whether you study Grammar or not. If you're curious of how English work, you can more easily learn Grammar. But, if you're not curious about it and just want to learn English, just read and listen while just referring to good English dictionaries.