Raghee Horner's GRaB system
The GreenRed&Blue EMA34 band (HCL) is used for this basic system. Simple: Green is a trade in Buy and Red in Sell. You also find her at FF and on YT. I prefer the EMA50 band, but adapt it to your needs.
The three candle files you find on FF as well. It is from a time where MT4 had only 8 buffers, that's why 3 files. The other band indicator is from PVSRA. It just looks better