Here are some links to videos to learn about the cell:
Introduction to the Cells – Amoeba Sisters (This video has captions. and has good explanations.)
Cell Structure by Nucleus Medical Media
A Tour of the Cell by Bozeman Science (there’s extra material so you may wish to skip to the cell structures)
(For a Crash Course review of the animal and plant cells. Captions available. Hank talks really fast.)
Endosymbiont Theory
Endosymbiotic Theory (Amoeba Sisters May 2017)
How we think complex cells evolved (by Ted-Ed by Adam Jacobson / Ted-Ed Feb 2015)