Here is the full solution for CraftConnections Day 84. Each group is shown with its difficulty colour and a redundant shape, so it stays readable if you are colour blind.
Classic — Day 84
● These give off light Campfire · Soul Campfire · Beacon · Oxidized Copper Lantern
▲ You can eat these Beetroot · Dried Kelp · Cooked Salmon · Raw Porkchop