This is one of the best indicator I am using in my chart, before entering a trader or before closing our trade, the Relative Strength Index (RSI) is extremely useful.
For what I am also experience using such Relative Strength Index (RSI), the higher timeframe we are using here, the more effective it is.
Same here, but this is only simplified version as a form of introduction to RSI related to trend changes and there is much more to RSI then it is written here, but it's a good start for new trader to learn about it. Feel free to add more info on this topic if you feel like it, I wouldn't mind more people using this topic.