Check the PWR jumper. If it's off and you haven't connected external power to the shield, the motors won't move even if the Arduino is on.
You are building a high-power robot, a delivery robot, or something requiring efficiency. The L298P technology is outdated and inefficient (it wastes battery life as heat).
⚠️ : Do not exceed 12V or 600mA per channel continuously.
0.6A per channel (1.2A peak) with thermal shutdown protection. Pinout and Hardware Setup
: Can drive up to 4 DC motors , 2 stepper motors (unipolar or bipolar), and 2 hobby servos (5V) concurrently.