A Smart or Programmable Splitter allows you to define which output of a splitter a product can be directed. Using the overflow feature of the splitter allows for excess product to be directed somewhere like the AWESOME Sink which in turn prevents your production lines from going dormant.
Here I will demonstrate how to build vertically for a copper node making copper products.
There's lots of debate between which is the better choice, Manifold or Load Balance. This article demonstrates both techniques.
Parts Per Minute is a key concept of the game, the buildings in the game input and output resources at a rate per minute. This also relates directly to the different conveyor belts that have different speeds.