If you read his letters all the way from 2008, you can see various phases:
1) 2008-2014 Deep Value coming out of the financial crisis, focused on financials and small caps
2) 2015-2019 High Quality Companies
3) 2019-2022 Future High Quality Companies
I find that he is a great investor to study as he is open in his letters, speaking about what he is learning about + his investing thesis on each new investment, which I believe is a great insight for those investors who like to "clone" other investors.
Almost all of his investments have crashed in the last 3 months, so could be an interesting hunting ground.
Just my opinion