For day trading, what tools do you use to determine (guess) the high and the low on an index (NDX, to be specific but would settle for SPX).
Im familiar (not an expert) with Gamma related levels (GEX) but what else can you use? I don't know TA or things like order flow and such so there may be something there. Anything else? Im specifically talking about intraday levels for 0dte trading.