As far as languages go, the ones I've been trying to learn are Spanish, Japanese, and German. Funnily enough, experience and the time which I picked each one of those up are in that same exact order.
Both Spanish and Japanese I've started out with classes, the former being from high school
and the longest time enrolled in the class. Japanese was one I had tried in college and admit to flunking after a while of being around folks that were too much into the anime business to where they were learning it to unleash their full "wannabe Japanese" mode. Apologizes for that as I don't really have room to talk about that myself...
For methods of learning, I know that there was a few Tumblr blogs I follow for Japanese vocabulary and maybe a bit of Spanish there too. German was a bit more rare to find and while I wanted to jump on the bandwagon of being a Langblr (language-focused Tumblr blog) but backed out due to stress. I admit to using Duolingo a bit for all three and then some when I feel adventurous enough. I also do try to look out for what other folks recommend as their way of studying language. For me, since I like to be a visual learner and pictures with words are the way to go - I like to find images online of vocabulary words and an example if applicable.