How to track data changes in SAP

Hello experts,

Iu2019m working on a project with a team of NON SAP architects and weu2019ve been asked to come up with some idea to keep a track of all the changes happened in SAP system by any user. So for instance let say if use makes a change and save it then this change should be gets recorded somewhere in SAP with the use, date, time, new data and pervious data. Also it should only happen when a change is made. So let say of there any change happens in SAP regardless of any t-code it should get save. Iu2019m not certain how to accomplish it. I need your expert advice please.

Thanks a lot in advance