Sharing a good YouTube video on the basic concepts of a Star Schema. Definitely worth a perusal for anyone wanting a primer on DW schemas.
The data is the dimension tables can also change, albeit less frequently. For e.g. a state changes it's name. A customer changes his last name, etc. These are known as 'slowly changing dimensions'. To support slowly changing dimensions, we would need to add timestamp columns to the dimension table. A good video explaining these concepts is available below: