I don’t mean to sound rude, but you might want to orient yourself with the software side of things a bit more before jumping into the deep end… From you nick name, I’m guessing you got the hardware side figured out just fine
Running commands in terminals without insight into what they do can lead to quite unexpected results…
The project you are trying to install on the Pi isn’t going to provide you UART control of the pi, but seems to be for a MCU based display system, as it’s only one direction (Pi → MCU).
If you still want to install it, clone the repo directly onto your pi, would be faster and easier than transferring the zip you have downloaded. You can access the Pi’s terminal either by directly connection a monitor and keyboard to it, or via ssh.
I’m not so old as the 2N2222 !!! and just starting about Pi. I’m ok with Atmel uC and C language!
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I need both !!! My system need to read all metadata (Tx from Pi) and must control the Volumio (Rx from Pi). The first part (I founded) is the file on the top of this topic.
If you are from the C and uC world, then this should be an easy script for you. Bash/Node/Pyhton would be what I would use here - you just need to fwd from uart to the Rest API…