To be honest I don’t know about this but they do their best for their country

1. 
   First of all let’s start with defioniton of word “Official visit”. Official visit – an official visit when a prospective person visits anywhere and will be paid by someone or something. I think the behavior of president that they behave in official visits means much for them.Therefore behavior rules , rules of that official visit , for example having official dinner with someone or travelling to somewhere.
   

2. 
   The purpose of official visits can be various , for instance to make a contract, to start cooperation, or to get acquainted.
   

3. 
   As I mentioned behavior of President during official visits is important. I can’t say exactly how presidents should behave theirselves during official visit cause I am not even politician. But the rules which should know everyone, rules of hygiene especially nowadays, giving the right of speaking to others I mean feeling that not only you on that official visit and etc.
   

4. 
   To be honest I don’t know about this but they do their best for their country.