I know folks are into trackers and managed funds, and trackers have done well in the past. But with these new apps that allow you to trade shares for free, I'd either go for specific shares or a managed fund that is small enough to be agile.
What is clear is that some businesses will suffer big. Others won't. In fact some will prosper. Netflicks, Amazon etc. will do well from this. Even beyond these obvious ones, there are other companies that the market have not reacted to yet. Laptop makers like HP have had a huge uplift in sales. I think we know that this virus is not going to be solved overnight. The premise of remote working and all the things we are seeing now are here for a while yet. So leave oil, travel, high street retail, as even when things open people won't be using them as much. Take a long term view on companies like Amazon, Walmart, Alli Baba who all service people from online. Short term laptop manufacturers, and any other companies making things that are in high demand (seeds, PPE, webcams, headsets, meeting software etc) are probably worthwhile investing in too.