FYI: if you are in India and have Covid-like symptoms now or in the next few weeks, just assume you have Covid and isolate immediately. Testing your contacts is a priority at that point, testing yourself is not - you are extremely likely to have it. Monitor yourself to see if you need medical attention, of course.
Why I did this
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).