What do I need to dock my handheld to a TV?

Three things that all have to line up: a port that supports video output (DisplayPort Alt Mode — not every USB-C port does), a dock or hub with enough power delivery to charge the device while driving a display, and enough bandwidth for your target resolution and refresh. The common failure is an underpowered hub that throttles the handheld or drops refresh under load. Confirm the device outputs the resolution you want over your specific dock while charging under gaming load — the cheapest hubs are where docking setups fall apart.