Step #1
Draw parallel line for outline of the staircase as shown.
Step #2
Draw bottom line for staircase as shown.
Step #3
Draw zigzag line at top portion as shown.
Step #4
Draw zigzag line at bottom portion as shown.
Step #5
Draw zigzag line at other side portion as shown.
Step #6
Draw step shape from bottom as shown.
Step #7
Draw steps shape as shown.
Step #8
Draw more steps shape as shown.
Step #9
Draw line as shown.
Step #10
Make necessary improvements to finish.