Cereals with the exceptions of corn and quinoa aren’t really worth it on a hobby farm, which anything under an acre certainly is. Oats, wheat, rye ect are all a pain to harvest and process. Growing corn you can do three sisters and really produce a ton of food per square meter. Quinoa grows kinda bushy but you can stick it anywhere and when it’s ready to harvest all you have to do is shake it.

Wild rice gets an honorable mention if you’ve got the right spot for it as it essential self seeds needs vary little care and all you really have to do is smack it with stick into tarp to harvest it.