MA's are a simple and an easy way to find the trend on anytime frame.
A lot of people use the 200 MA to define trend but I've always preferred EMA's.
This is a 150 ema and 250 ema cloud. Ema's can act as support and resistance. Instead S/R being a single line on the chart S/R is seen more as an area on support and therefore a cloud is more suitable in defining the area around the 200 ema.
Rules
1. Above the cloud the assumption is bullish 2 .Below the cloud the assumption is bearish 3 . Change in color is confirmation of a trend change
Note that all MA's lag so use with confluence of other technical indicators.