USB-C describes a connector shape, not a guarantee of particular speed or capability. Two devices with USB-C ports may support different combinations of data transfer, charging, and video output. Read the device specifications and look for port symbols or labels. This is especially important when connecting a laptop to a monitor, external drive, or docking station.
Charging depends on the power supported by both the charger and the device, along with a suitable cable. A higher-capacity charger will not force a compatible device to draw more power than it accepts, but a low-capacity charger may not keep up during demanding use. Cables also vary: some are designed mainly for charging, while others support faster data or display signals.
For a monitor, confirm that the computer's port supports video and that the display can receive it through the chosen cable or dock. If something does not work, simplify the connection by removing adapters and testing a known-compatible cable. Avoid judging a cable by thickness or connector color alone. Keeping a small set of clearly labeled, reliable cables can prevent confusion when devices look identical but require different capabilities.