https://swaywm.org/

The Arch wiki page for Sway is a pretty good starting point: https://wiki.archlinux.org/title/Sway#Configuration.

FWIW I was also an i3 user for a long time (and xmonad before that), and I’m a very happy convert to Sway.

There is a Manjaro Sway community flavor if you want to USB boot something preconfigured and check it out.