Flat is useful, but drainage is essential
A flat tent pad feels comfortable at first, but the best site also gives water somewhere else to go. Avoid obvious low spots, compacted bowls, dry creek channels, and places where water marks suggest runoff.
If rain is possible, look at the ground before unpacking. A few minutes of site reading can prevent a long night of moisture under the floor.
Use tension to create structure
A tent is not fully set up just because the poles are standing. Fabric needs even tension so wind can move around the shelter instead of folding it inward.
Stake corners cleanly, adjust guylines, and recheck after the fabric relaxes. This is especially important when temperatures drop or when rain stretches the fly.
Ventilation is part of weather protection
Closing every vent can feel warmer, but trapped moisture often becomes condensation. A small amount of airflow helps sleeping bags and clothing stay drier.
The goal is not maximum openness. It is balanced airflow: enough to move damp air out, while still blocking wind and rain from the sleeping area.