How can i use nmp commands such as nmp start and nmp test?

Hi im new to web devaloping, for testing, I used this github repohttps://github.com/ChrisMichaelPerezSantiago/animefly
It said i needed to do nmp start and install node, but when I do nmp start, it says it dosent exist or something, Any thing is helpful

Should be npm, try that.