This script attempts to use Exponential Moving averages (short-term and long-term convergence) of different lengths in order to identify trade entries and exits for bullish & bearish trades. I would strongly recommend using this as a guide to enter or exit long-term swing trades on growth names such as Apple, Tesla, Microsoft to keep your emotions out of the trading. You use this script by entering a trade when it signals a green BUY signal with a UP arrow and exiting when it signals red. The general idea is that one is fast and one is slow-moving EMA and these indicate when to buy/sell when they crossover the overbought/sold lines.
Disclaimer: This script is for educational purposes only. The market is always moving up or down, so always trade with caution and use your best judgment for every trade.