I’m having trouble with Putty on my Windows 10 laptop. I can not get it to open a terminal window. What com port should I be using? Is there a good tutorial for this?
Please, have a look at https://www.arduino.cc/en/Guide/Windows#toc4 to see how to determine the COM port your Arduino is connected, too. Then try to connect to this port using PuTTY. Remember to switch the connection type to serial.
What type of serial connection are you using? A serial port or emulated with usb? If is the secound option, you will be to install windows 10 drivers of the usb-serial.