If you're trying to decide to learn a language, or which language to learn, you will have quite a few questions. What to learn? How to learn it? Should I attend a class, or get some books? What kind of apps are out there? Which is the best? The worst part is, for every question you have you'll find a hundred answers, opinions, and guesses. And to tell you the truth, what works for others may not always work for you. So you may be even more confused or frustrated.
To avoid that mess and clear up the confusion, I have written up the guidelines that I've used whenever I needed to make a decision or to help my students decide with language learning. It's the first book of a series under the title "The Rosetta Stone Challenge". You will learn what you need to know to find the best materials and how to use them to your advantage in a way that will give you confidence in studying your new language.