

У меня всё хорошо.
Everything is fine with me.
Ты всё понял?
Did you understand everything?
Я уже всё сделал.
I've already done everything.
"всё" is in the lesson "Pronouns" (Level 30), along with 17 other useful words. LinDuo has 180 topic lessons like this one, 2,380 words in total. Every word has an illustration, a transcription and pronunciation in a female and a male voice. Just 10–15 minutes a day is enough to learn them all. Free, and works offline.