How can I efficiently utilize 2x4s for building garage shelves?

To efficiently utilize 2x4s for building garage shelves, start by measuring the space and planning the design. Cut the 2x4s to the desired lengths for the shelves and supports. Use screws or nails to secure the 2x4s together to create the frame and shelves. Consider adding additional support brackets for stability. Lastly, attach the shelves to the wall or ceiling for a sturdy storage solution.