Salam.
One of the most useful ways of trading is to understand the price actions or movements. There are actually 3 types of price actions:

Trading with round numbers
Trading with Psycho levels
Trading with historic prices

Trading with round numbers: Examples of round numbers are like 1.4900, 1.46500, and others alike.
A Psycho levels price are like 1.50000, 1.60000 and [...]