Here is the full solution for CraftConnections Day 3. Each group is shown with its difficulty colour and a redundant shape, so it stays readable if you are colour blind.
Classic — Day 3
● Leaves Dark Oak Leaves · Jungle Leaves · Oak Leaves · Birch Leaves
▲ Blocks that hold your stuff Smoker · Furnace · Barrel · Shulker Box
◆ These give off light Campfire · Pearlescent Froglight · Oxidized Copper Lantern · Enchanting Table
★ Crafted with iron Smithing Table · Block of Iron · Stonecutter · Cauldron
No-overlap — Day 3
● Shovels Iron Shovel · Diamond Shovel · Copper Shovel · Stone Shovel