No passengers while your learning.
When you do have a passenger.
Tell them that they are not to get on or off the bike until you tell them. Tell them to lean with you and not against you.
That they are not to be jumping around.
Make sure they have gear on too.
The bike is going to react differently with their added weight.
A good passenger is hard to find, but a pleasure to ride with.
If their helmet keeps bouncing off yours you are not riding smoothly.
A piece of black electrical tape at the top of the visor helps block the sun when the sun is low in the sky.
"Happiness makes up in height for what it lacks in length" Robert Frost
"Never complain. Never explain" - Henry Ford