Unless you expect to have Itemized Deductions greater than the standard Deduction allowed ($12,200 for 2019), it is okay to skip Line 1.
The worksheet is helpful to taxpayers who will have in excess of the $12,200 in itemized deductions, adjustments to income (IRA deduction, deductible part of self-employment tax, etc.), and non wage income (alimony, business income reported on Schedule C, income received on 1099-Rs, rental income, etc.).
