Campfire. The first and only source of heat, light, and also a means for cooking. Irreplaceable at the beginning of the game. It dries during rain / snow.
Flax. Without it, nowhere. From the flax, strings are made. Threads are needed everywhere: tools, weapons, bandages, armor, etc. It grows everywhere, but only in a checkerboard pattern. You can find it in the same place where the wheat seeds.
The campfire interface is similar to the stove. According to the functional - this is the same oven, but with a reduced by 4 times cooking time and reduced recipes (only food is available in the basics)
Storage. Very convenient alternative to chests. They do not need to craft. You just click the LMB, for example, the cobblestones on the ground to this place was a warehouse with a rock.
Furnace. Yes, the furnace is now multi-block and is built from a special furnace block. To build it is not so easy, because you need a lot of cobblestone and clay. Requires open access to the sky, and also does not work in mines.
Barricades. Like the web, but still cause damage. Helps protect you from the attacks of mobs in the beginning of the game. Cheap to manufacture.