A monthly support zone is a place, not a line you hope for
A line is easy to draw. A zone has to survive being explained to another person in the room.
The most common pencil on a new student's monthly chart is a single horizontal line snapped to the most convenient low. It looks decisive. It usually connects a wick from a panicked month to nothing else the market has respected. In the study room that line is erased before the sitting moves on.
A support zone, in the way this room uses the words, is a band of price where the market has stopped and closed more than once, across enough time that a single month cannot take credit for it. The band has a top and a bottom. Both edges should be closes or clusters of closes, not the most dramatic wick in the decade. If the only touch is a wick, the mark is a spike, and spikes are noted as events rather than as places the market lives.
The test used at the table is verbal. The student has to say, without looking at a lower timeframe, which months stopped inside the band and which monthly close left it. If the sentence needs the daily chart to make sense, the zone is not ready. Long-term market study is unforgiving on this point because the monthly sheet is the one a person can still read years later without the software that drew the line.
Width matters. A zone that is drawn so wide it contains half the chart cannot be wrong, and therefore cannot teach anything. A zone drawn so tight it only works if the low is measured to the last traded increment will break the next time the contract rolls or the index is rebased. The room asks for a band a person could see from across the table.
Hope is the enemy of the band. Students widen the zone after a close that missed it, so the old mark can stay 'correct.' The rule on the horizon desk is the opposite. If the monthly close finishes through the band and the next month does not reclaim it, the notebook records a failed place. Failed places are useful. They are how a reading changes without the student pretending the original pencil was wiser than the market.
Bring one market to a sitting if you want this practiced on your own sheet. Bring a line you love, and expect to be asked which closes, not which wishes, hold it up.