I start by going to the 1 month timeframe to look for key support/resistance levels. Some call this the "top-down analysis" method because you start looking for these key levels from higher timeframes first, and then you go down too lower timeframes.
In the chart i attached, I am viewing the charts through a 1-month timeframe using an MT4 platform and i used "period seperators" to divide the screen into different years. Note that on a 1-month time frame, every candlestick represents one month.
If you look at the charts you will observe that between 2023 & 2024, price was unable to break through the 1.11973 level so I marked it as a key resistance level.
If price is able gather enough momemtum to break this resistance level, it may continue in the breakout direction for a while till the momentu is expired.
In April of 2025 (the 4th green candle on the chart), you will observe price broke through the key resistance level in the upward direction and maintained the momentum for a while.
Also observe that in May 2025 (last red candle on the chart), price gathered enough momentum to fall and break through the key resistance level (now turned support) and the likelihood is that price will also continue in the downward direction till the momentum is expired.
So, when you spot a key resistance/support level like this on a higher timefrme, you mark it with a horizontal line so it can guide you in forming your trading strategy.