Which cycle should I focus on?

There is no single standard answer to this question; the core principle is "big cycle sets the direction, small cycle finds the timing."
Different trading styles correspond to different cycle combinations:

Intraday/Short-term (contracts, forex, crypto):
Commonly use 15-minute/30-minute (to find entry) + 1-hour/4-hour (to set direction).
Small cycles look for trigger signals, while the big cycle ensures no counter-trend moves.

Swing/Medium-term (stocks, futures):
Commonly use daily chart (to find entry) + weekly chart (to set direction).
Follow the weekly trend, enter when the daily pullback is in place.

Mid-to-long-term (US stocks, value investing):
Commonly use weekly/monthly charts (to set direction) + daily chart (to find entry).

Key mindset:

Small cycles obey the big cycle:
When the big cycle is bearish, try to ignore long signals from the small cycle to effectively reduce being trapped.

Don’t look at just one cycle:
Single-cycle analysis can easily fall into local noise; at least verify with two cycles—one big and one small.

Beginners are advised to start with the daily chart:
The daily chart filters out a lot of short-term noise, making the main trend easier to see.
Once stable, combine with smaller cycles.