In part 1[0] of this series of posts, the author mentions they use Pragmata Pro [1].

[0]: https://arne.me/articles/emacs-from-scratch-part-one-foundat...

[1]: https://fsd.it/shop/fonts/pragmatapro/

PragmataPro is pretty good, but if you don't want to pay for a font, then the free Iosevka font is fairly similar I think.

From the first part:

  (use-package emacs
    :init
    (set-face-attribute 'default nil
      :font "PragmataPro Mono Liga"
      :height 160))