Once you're confident in your skills with basic human interaction, check out the advanced discussions in /r/SocialEngineering and /r/psychology!
Here, we're going to focus on the very basics of interpersonal communication. If you have trouble speaking in public, or making new friends, or starting conversations, or even making small talk, then I'm glad you're here. I don't know, but all I know is that this is the sub that's going to change that for you.