You take one lesson everyday, which basically consists of listening to an audio, reading, grammar and pronunciation explanations, exercises and, at a certain point, translations. The lessons take about 15-30 minutes.
I know it doesn't sound particularly different from many other methods, but their approach really eases you into the language and you progress without even noticing. Besides it has a good number of lessons to give you some confidence and it covers a couple of language skills.
Having said that, I don't think it's good to rely on one single source. As a beginner you can use Duolingo for vocabulary, write Notebook entries on Italki and listen to songs and etc.
With time you'll find what works for you and soon you will be able to read something, follow YouTube channels in your target language, watch films and, when you're ready, chat with natives.
Look at this.