Because he should use Lichess!
Should I use Lichess?
One advantage of Lichess is that you can do an unlimited number of puzzles without paying for a subscription. (You can also solve puzzles without registering, but then they don't adapt to your level.)
It also has a few interesting blogs, such as grandmaster Noël Studer's blog, grandmaster Avetik Grigoryan's blog and NDPatzer's blog (check the "Science of Chess" series of blog posts).
why did you revive this?