What Moving does, and when it works.
A moving average smooths price into a single line so you can see trend direction without the candle-by-candle noise. The SMA weights every bar equally; the EMA weights recent bars more, so it turns faster.
In crypto, the EMA is usually preferred because moves are fast and the extra lag of an SMA gets you in late. Common setups stack a fast and slow EMA (e.g. 21/55) and trade the cross, or use a single higher-timeframe EMA as a directional bias filter.
It is the most over-relied-on tool in trading: a moving average tells you nothing in a range and whipsaws hard in chop. Treat it as context, not a signal generator.