After the crash I bought some airlines thinking they would recover by the end of the year. Sold them for some profit when I realized it would take years not months.
I also made a little money on INO and CODX before they dropped back down.
Since then I've expanded to hold AAPL, MSFT, TSLA, and ARKK, ARKW, VUG, ICLN. These have done well and will be the heart of my portfolio.
I bought PLTR off their IPO last week, but I've been burned by a few IPO's and pennystocks, so not a long term hold.
===
This was all during my time working from home since March, before that my money was in a few vanilla mutual funds, I've done a lot better learning and making a few trades here and there.