If you're just learning about the language, one of the best ways to start is by reading the lessons. The lessons here are written and organized in a way similar to Tae Kim's Guide to Japanese to teach you every facet of Numo's grammar from the ground up by explaining them in English. Of course, no guide alone can completely teach you a language in a way that you won't forget, but this one builds upon each previous lesson and includes drills so that if you truly read everything from beginning to end you will gain a good grasp of the language which can be further improved by using it in conversation or one of the immersion projects.