Basic Etiquette
Never use your left hand by itself to indicate or pass something. Use your right hand or both of your hands at once. An elder's disrespect is regarded as being particularly insulting. Some South Sudanese might think that being disrespectful can put a curse on the offender. If someone is older than you, use their formal title or a family connection while addressing them (see Naming for more information on this).
Look down and avoid direct eye contact with those who have a greater social position than you to show respect. People of significantly higher standing may be greeted or served while on their knees. Both women and children may bow down to their husbands and elders.
People from South Sudan frequently take time in a laid-back manner. Being late is common and not a sign of disrespect. Only that something "came up" is intended (usually within the family or among close friends). Sometimes being late is correlated with social standing. Everyone anticipates important individuals to arrive late while they are being waited on.