IMHO the best way to learn a language is a Michel Thomas audio course. Also, whatever way you choose, adding another one or more (whatever) as soon as you become fluent in the way you have picked up initially is a great idea.
The most annoying problem with Duolingo is it quickly becomes boring by asking you stupid questions repeatedly, you start daydreaming and clicking-through the questions-answers too fast, making mistakes purely out of lack of attention (so you click a wrong one although the right answer is obvious to you) and it reacts with asking you more stupid questions, the same or on the same topic. It really should let you progress faster then just ask you to repeat what you have learnt occasionally (but not too soon and not too much).
Nevertheless I wish more subjects would be available to learn the Duolingo way. I.e I'd love to study math, history, literature, biology, geography etc like that. I hope Duolingo authors will eventually come up with such a universal non-language-centric kind of platform and let users publish courses on different kinds of subjects.
The most annoying problem with Duolingo is it quickly becomes boring by asking you stupid questions repeatedly, you start daydreaming and clicking-through the questions-answers too fast, making mistakes purely out of lack of attention (so you click a wrong one although the right answer is obvious to you) and it reacts with asking you more stupid questions, the same or on the same topic. It really should let you progress faster then just ask you to repeat what you have learnt occasionally (but not too soon and not too much).
Nevertheless I wish more subjects would be available to learn the Duolingo way. I.e I'd love to study math, history, literature, biology, geography etc like that. I hope Duolingo authors will eventually come up with such a universal non-language-centric kind of platform and let users publish courses on different kinds of subjects.