Some basic lectures

https://www.youtube.com/watch?v=jrLYCzCc77g&hd=1 by Jimmi Zhang

https://www.youtube.com/watch?v=3Ry7gl-LSGA&hd=1 by Sarah Gage-Hunt

https://www.youtube.com/watch?v=wthGEGUrYgA&hd=1