I added many alerts along with the Bullish and Bearish alerts when the MACD crosses over the Upperband or crosses down on the Lowerband.
I personally use this indicator with Crypto charts (Bitcoin on a 15min, 1hour, and 4 hour timeframe) as one of many confirmations that it's a good time to enter a trade. This script was made to be easy to follow with the colors of GREEN triangles being a good uptrend or entry confirmation, and RED being a confirmation to sell/short or exit your trade.
It's important to use this indicator in combination with other indicators that can give you more confirmations to enter or exit a trade, and make sure you are on normal candles and not HA or any other candles as you can get wildly inaccurate results.
This script also has the Death & Golden crosses, which is the slow and fast moving averages crossing over each other. I don't use this as an additional confirmation, it's just nice to know where the cross happens.
In true TradingView spirit, the author of this script has published it open-source, so traders can understand and verify it. Cheers to the author! You may use it for free, but reuse of this code in a publication is governed by House Rules. You can favorite it to use it on a chart.