Deductions take many many forms and names. They depend on
situations too and the type of income you have or how you earned
it.
Your question is entirely too broad to have any list or
comprehensive answer.
However, as a start:
Try the IRS website. www. IRS.GOV and type in "DEDUCTIONS" in
their search engine. You might want to be more specific about the
deductions you are looking or, i.e. deductions for homeowners
deductions for day care deductions for business deductions for
travel deductions for investing deductions for medical etc, etc
....