controlling arduino using keyboard any help please

hi I am new in using arduino and I want to control the arduino directly from the keyboard without using serial monitor to type the characters I used a program called ""serial switch"" as an example but it tells me to enter the character from serial monitor but I want to enter it directly from the keyboard without having to open serial monitor

You'll need to plug the keyboard into the Arduino, if you don't want any application on the PC involved in reading the key strokes and sending them to the Arduino.

Alternatively if you can get a keyboard with an RS232 output, you can put that through a RS232 to TTL converter and feed it directly into the arduino.