This is the 161st most frequent Japanese word.
ご
A polite honorific prefix in Japanese.
ご is used as a respectful prefix to the noun 注意 (caution), elevating the formality of the expression.
ご注意ください。
Please take caution.
ご is used here as a respectful prefix to 案内 (guidance, information), showing politeness in the announcement.
これはご案内申し上げます。
This is to inform you.
ご precedes 両親 (parents), showing respect when referring to someone's parents in conversation.