I read several answers but those can be confusing, because it depends how you provide power to Arduino.

What if I use wall adapter 5v 1a and connect directly to Arduino Nano USB type-c port, how much current will support that 5v pin then?

For instance, can I power 1A lamp from 5v pin + ground pin?

if no, what is preferable way to do this if I still want to use USB port?

thank you