Many thousands of articles have been written about the coronavirus. Here are some of the most helpful:
What is this disease?
The LA Times recorded a half-hour lecture by their very own executive chairman, Dr Patrick Soon-Shiong, providing the scientific background to the coronavirus. Dr Soon-Shiong is a surgeon and scientist based at the University of California and his video provides a clear medical overview of Covid-19, complete with many visualizations of the virus and its effects.