eg Account, Contact, Opportunities, Cases, Price Books etc
Bespoke items eg survey custom objects items like prospects
Under Optional features, always check items and then remove them eg Track field history otherwise you cannot add them later.
Once you have completed and saved the new field, go back to the Custom Object page and Set History Tracking under Custom Fields & Relationships by clicking the button. On the next page, check boxes for items you want to track and save.