DUOLINGO:
Duolingo helps you learn new vocabulary and grammar through interactive games and quizzes both online and on their easy-to-use mobile app.
Duolingo separates each lesson by category (food vocabulary, family vocabulary, the verb “to be,” etc.) and—on the desktop version at least—includes helpful tips and notes in case you need more explanation.
Duolingo also lets you set goals and shows your progress as you use the program. You also have to complete lessons to “unlock” new lessons. All of this is great for lazy language learners who need a little extra motivation!