In previous article "Where to start?" we stopped on language course choose. And if you decided to start with Duolingo, the best way to have as much experience as you can is to begin with PC version. Also there are phone applications for Android and iOS. The main difference is that PC version has grammar in the Tips&Notes section almost in every course topic. In my attempts to learn language as soon as possible I made notes for every grammar rule that I learnt from it.