The gaming edition of garuda is basically preinstalled software that can be browsed in garuda-gamer. You prolly won’t need them all so it’s better to just use what you want. Like wine for windows software, heroic launcher for same reasons (handling wine prefixes and stuff). Steam for more games. Other than that for controllers you can look up the forum for software you need.
As filo mentioned it’s discouraged. You can check this out.
A more complex guide involving refind. (both guides written by same person)
Edit:
finally found the post regarding the controller,