Simple Indicators for Beginners

After some simple research I found 3 indicators which are very easy to read and help opening long or short positions

1) RSI (shows if the coin/stock is oversold or overbought in a specified timeframe)
2) SuperTrend (Indicates Buy/sell signal )
3) Backtest Single EMA cross (trend lines and buy/sell signals)

I'll update if any better indicators is found.
If anyone has other good indicators please share.