Effective boardwork—whether teaching on a chalkboard, whiteboard, or on Zoom—is an essential part of communicating mathematical ideas clearly.
Clearly label which problem you are working on. Write a summarized problem statement.
Writing should be large and legible.
Distinct problems should be clearly separated, e.g., by drawing a vertical line down the board between them.
Do not stand in front of what you just wrote. Step aside after writing each step. Pause to give students time to absorb what was said.
Erase the oldest material first, not what you just wrote.