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Learn GermanHey, I don't pretend I know the best but a website or application I like a lot is Memrize, kind of a Duolingo but better according to me. And I use it besides a manual for beginners to have the basics of grammar and of course Repeto for some practice and vocabulary :)
I did not learn German using language courses but I did quite a few courses in French, so I have got pretty good idea what is there. If you are looking for a comprehensive German language course, you should probably try babbel.com.
Their courses have got a lot of content, you will find good grammar, vocabulary lesson, dialogues, etc. The only criticism I have that I could it a bit boring but, they may offer a free trial so you can at least have a look.
I actually think that using one resource for longer period of time is a great strategy of learning German because you will actually see the progress you are making and stay motivated. When learning French I made a mistake of using too many learning resources so yes, I am sure you will do well sticking to one thing.