The most common usage is the moving average crossover system when you buy and sell when a crossover happens. This system is in general not very profitable but can be used effectively in trending markets.
There is really no general rule to what length should be used. The most well-known and respected lengths are 20 / 50 / 100 / 200 for almost all average. These values are respected as strong resistance and support levels. but if you plan to use a crossover Systems the most profitable settings tend to be when the averages are close together 14 and 28 etc. But this is an area I would appeal to for you to really try out what works and what does not.
Other uses of moving averages are the following:
- Crossover system
Moving averages are pointing up and price crosses below (Buy Pullback)
The slow-moving average is Below the fast moving average to help to identify possible bullishness
Can be used as lines
If you are an