Generally debugs messages in Arduino is done by Serial.print*, and show in this monitor serial, or another serial tool, as screen, pyserial, coolterm, etc. The Arduino official IDE, not have debugger.

Nextion Arduino library provides an easy-to-use way to manipulate Nextion serial displays. Users can use the libarry freely, either in commerical projects or open-source prjects, without any ...

USB to serial boards are necessary to program and debug boards, and/or access the serial console, and while they are very cheap, you may be in a situation where you don’t have any around, but you do ...