Design 3D Shapes: The Cube!
Choose a size and make 1 Squeare Base, 2 Side Faces, 1 Single Edge in the same size.
Read every step before joining any pieces, and be sure to understand how it works. You can use pieces from other steps to help yourself check the geometry and join with the right angles.
Attach each Side Face perpendicular (90º) to Full Triangle at A, B with a small bead.
Attach every Single edge to both Side Faces at C with a small bead.