When learning a language, a good strategy is to learn the most frequently used words in that language first.
Thankfully, Wiktionary has a list with links to get the most frequently used words in a lot of languages.
Frequency Lists on Wiktionary
Duolingo - Free language learning that uses spaced repetition and gamification to increase effectiveness.
Tatoeba - Collection of sentences and translations.
Anki - Amazing app for learning anything (including languges) using spaced repetition.