What does making money in the calendar mean?

"Making money" in the calendar refers to lending money by yourself or lending money to earn interest.

"Hee Sa Flat House Book": The wealth of the month, the four seasons, the hour, the whole day and the five wealth is appropriate. Avoid building the moon, breaking it, consuming too much, on weekdays, closing the sun, robbing, calamity, moon deficiency, moon punishment, moon damage, moon fatigue, big time, celestial officials, small consumption, thieves, four consumption, four waste, four poverty, five deficiency, nine deficiency one day.