For those who think the young have nothing to worry about: even if they do not die, a lot of people in their 20s and 30s will need to be hospitalised because of it. And quite a few of those are expected to have lasting lung damage. The US CDC report reports this happened to about 1 in 5 young adults (see Table), but I think those precise numbers are in doubt because of the number of undiagnosed cases in the US.
I am not an expert on Covid, viruses, or vaccines, but I am a scientist with relevant training. I believe we have a responsibility to clearly communicate science to the public, especially in emergencies. So I started to write summaries of Covid developments on facebook in March 2020 to help friends and family understand the situation as it unfolded. This is an archive of those posts (created much later).