Using the search function with the words "lerp explanation" this is one one of the posts I found..
You can try the search function yourself and find even more..
Lerp is a very simple function
Lerp stands for Linear intERPolation
This function need 3 numbers parameter
a and b are whatever number you want
but t goes from 0 to 1 (well it can go under and over but... let's keep things simple)
lerp(a,b,0) returns a
learp(a,b,1) returns b
the values in between 0 and 1 returns a number X between a and b such as X-a = (b-a)*t
so t describe more or less where you are in between a and b
lerp(a,b,0.5) return the middle so a+(b-a)/2
lerp(0,10,0) = 0
lerp(0,10,1) = 10
lerp(0,10,0.5) = 5
the way newt use it with