Green by Hiroshi Yoshimura
I love your enthusiasm and I love that you are asking questions! Also cool that you feel an urge to learn.
That being said, it is rather many questions you are asking at the same time :)
Watch this brilliant series, it should give you a grasp of what is going on, then take it from there.
Computer Science Crash Course: https://www.youtube.com/watch?v=O5nskjZ_GoI&list=PL8dPuuaLjXtNlUrzyH5r6jN9ulIgZBpdo
Typically IR transmitter LEDs are transparent or light blueish, to allow as many photons as possible to exit the LED.
Typically IR receiver LEDs are dark, almost black, made to block out visible light and only pass through infrared wavelengths of light.
Here you see an IR transmitter LED on top and an IR receiver LED below that.
It is an infrared receiver extension cord.
Say you have a device that is controlled by an infrared remote, but is tucked away out of line of sight.
You can use this cord to move the infrared receiver into sight.
Here it is on amazon : https://www.amazon.com/uxcell-Infrared-Receiver-Receiving-Distance/dp/B07FKMK3GZ
Okay, so I didn’t know how to make spoilers either, so I thought to find out.
Now the question is how do escape the code for spoilers, so I can display it here, without making more spoilers …
Do you mean “No bitcoin is useless” - none of the bitcoins are useless.
or
“No. Bitcoins are useless” - all the bitcoins are useless.
(I’m totally with you though)