The essence of trading is to go with the big trend and oppose the small trend!

This phrase is a classic principle in trend trading, also called "Follow the major trend, oppose the minor trend":
Follow the major (follow the big trend): First look at the larger cycle (such as daily or weekly charts) to determine the main trend direction, only take trades that align with the trend, and do not fight against the trend.
Oppose the minor (oppose the small trend): Under the premise that the big trend remains unchanged, wait for a counter-trend correction or rebound on smaller cycles (such as 1-hour or 15-minute charts), and buy low/sell high against the small cycle direction to find better entry points and stop-loss levels.
The essence is to use the "directional certainty" of the larger cycle to protect oneself, and to take low-cost positions during the "corrections" on smaller cycles, thereby achieving small stop-losses and a high reward-to-risk ratio.