For Arch Linux it would be
yay -S brave-bin
with yay (there are a lot of AUR’s managers for example pamac, yourt…)
or
git clone https://aur.archlinux.org/brave-bin.git
cd brave-bin
makepkg -si
without any manager
but in my opinion AUR isn’t good solution for web browser because files are maintained by anonymous users so I do not trust it fully and it’s additional installation form.
The better way would be create an official pacman repository like all other browsers (firefox, chromium, opera) or use AUR but maitained by official Brave team, not random user. It’s easy to create this PKGBUILD package from build (https://wiki.archlinux.org/index.php/creating_packages)
Currently the best way to install brave in my opion is download build file:
brave-v1.4.96-linux-x64.zip
unpack it and run by “brave” file.