How to make automatic update every pages to 1 page

[X-Jinx Su]

Mod please help me.I try to ask here but,no answer.
1.I would like to have automatic update on 1 page or 1 field for the latest information
what the script I must place it or something I Must to be ?
Help me please,I don't know how to explain to get everyone to get to know what I want.
thank you so much for your help...