If you use trains to transport resources then you are going to want to make sure the train can supply enough resources to last the round trip. This video explains how to calculate this along with a working example. This video also explains the theory behind using buffers for the freight platforms.
Train freight platforms will cease input/output operations when a load/unload operation occurs. This video shows how to use fluid buffers with train fluid platforms to ensure your production line will always receive fluid during load/unload operations.
A build train is central storage on wheels. It really helps when building at a remote location, you have everything you need on hand.
This guide shows you how build a temporary setup to generate plastic and rubber.
Manual Automation shows you how to use storage containers for the inputs and outputs of a machine and hence you can fill those containers with materials and parts will automatically be created, all you need to do is top up the containers occasionally.