Here's more about it:
But to keep it simply, you just use lerp(a,b,c) where:
a: is the current position of the object
b: is the position you want the object to go to
c: is the speed you want the object to go there (you should always multiply it by dt so the movement is framerate independent)
So if you do "every tick -> set sprite X position to lerp(sprite.x,100,2*dt) it will move the sprite horizontally until it gets to X=100, at 2*dt speed.