Let me introduce myself. I'm Reneperrin and I've the desire to set up Russian parallels sites for business(Since most of my new clients are Russians). But in order to do that, I need to get training from Russian language course providing sites, since I am not Russian. With a view to doing that, I am looking on different sites like- duolingo, lingq.com, https//www.echoee.com etc. While imost of them have significantly great teaching methods and preparatory exams, which one of them would be good for beginners like me?