RE: Time to stock up at boo16 Feb 2022 16:09
MACD crossover? This is when the MACD line and the signal line intercept & may indicate a reversal.
Trend line break? On the Weekly Chart the SP has a high of 269.32 (26.9.2021) & 205.14 (14.11.2021). If you draw a diagonal trend line between the two highs & extend the line vertically downwards the current Weekly SP has crossed the trend line.
Further confirmation would come from the 10 Period SMA on the Weekly Chart being crossed - This is a BUY signal for some.