How to Create a Audit table

Question

How to Create a Audit table for Insert, Update,Delete...?

For this Audit table how to write Trigger..? 

 

This is my Table 

 

Create table  Cust

 CustID  int PK

,PersonID   int FK

,StoreID  int FK

,TerritoryID   int FK

,AccountNumber   Computed varchar(10)

,rowguid   Uniqueidentifier

,ModifiedDate  datetime