Traffic Handling… The art and skill of passing formal written messages over Amateur Radio networks without harming the internet, it can’t be that hard can it?
The procedures are relatively well defined depending on how much reading you want to do.
Radio Relay International have training materials and manuals available here.
The ‘original’ ARRL National Traffic System Methods and Practice guidance runs to many files and hundreds of pages here.
These were distilled down by the International Amateur Radio Union to a HF Emergency Operating Procedure but this is rather short.
The ability to maintain a network in all the variations of propagation and required times of operation however is a different challenge. The graphic above shows the coverage area of my station on the 40m band in Winter, just not at the bottom of the Solar Cycle…