Sal Khan is a pioneer in free online learning. He literally started Khan Academy by making math tutoring videos with his microphone and tablet in the closet of his home, and mainly for his little cousins. He's a national treasure. Currently Khan Academy is a rich website full of video education on a variety of subjects, presented clearly. Math, Science, Finance, Art and Music Appreciation, Computer Coding... Here  is a link to the video log from a webinar in April about getting/keeping young students motivated and engaged in their learning at home.