The game starts at 0:00, but jungle tracking starts at 0:35 — when minions meet in lane.
At 0:35, look at the minimap. Which side lane arrived late to their minions? That lane leashed for their jungler, which means the enemy jungler started on that side of the map.
If bot lane arrived late → enemy jungler started blue buff.
If top lane arrived late → enemy jungler started red buff.
This single piece of information tells you:
• Which direction the enemy jungler is pathing.
• Which lane they'll gank first (the opposite side of their start).
• When they'll finish their clear (about 1:50-2:05).
• Where their second buff will respawn (5:00 from their start time).
If you know the enemy started blue, they'll gank top at ~2:00. Ping your top laner to play safe. If you're the jungler, you can now path to counter-gank or invade their opposite-side jungle.