Here is information on the limitations you asked about
Mortgage Interest - For mortgages taken out after December 15, 2017, you are limited to the interest on indebtedness of up to $750,000 if you are filing single, married filling jointly or head of household. ($375,000 if married filing separately) For mortgages taken out on or before December 15, 2017, you can deduct interest on up to $1 million of indebtedness.
Property taxes - There is a $10,000 limit ($5,000 MFS) for property tax and state taxes. You may have heard it referred to as "SALT"-- State And Local Tax. This includes property tax, any state tax paid, and includes any state withholding from your W2s and any 1099s you have.
Charitable donations - In most cases, the amount of charitable cash contributions taxpayers can deduct on Schedule A as an itemized deduction is limited to a percentage (usually 60 percent) of the taxpayer’s adjusted gross income (AGI). There are certain qualified contributions that are not limited.
Child and Dependent Care Credit - The maximimum amount of child care you can use for the credit is $3,000 per child.
For the 2020 tax return, the standard deduction is:
Single or Married Filing Separately - $12,400
Married Filing Jointly or Qualified Widow(er) - $24,800
Heal of Household: $18,600
