ICT's content on OTE would lay out some principles. He's been trading Forex for 20+yrs. tldr; higher timeframes for key levels of reaction combined with his logic of Market Maker pricing models
Don’t take high risk in your trading because it leads to balance crashes and a threat to survival. So, traders should go ahead slowly so they can stay in the market for a long time and generate proper ideas over the market.
Standard reversal bar is:- H > H[1] and C < C[1] and C < O for down move and L < L[1] and C > C[1] and C > O for up move. Other qualifiers can be added. Below I've also required Reversal down signal to be above BBMidLine and Reversal up signal to be below BBMidLine:-