Get a 1040 income tax form (
https://www.irs.gov/pub/irs-pdf/f1040.pdf).
There are two main ways to reduce income taxes:
1. Deductions. These reduce your taxable income dollar for dollar. These are found at lines 23 through 35 and then line 40 and 42. Easiest ones for you here are probably putting $5,500 into a traditional IRA or contributing to an HSA, but maybe some of the others apply or you can find ways to get them to apply to you. The other thing to look at is Schedule A where you might be able to itemize your deductions if you have mortgage interest, property taxes, charitable deductions, or high medical expenses - which you probably don't yet.
2. Credits. These reduce your tax owed dollar for dollar. These are found around lines 46 through 54 and 66 through 73. Again the game is to see if any of these apply to you or you can rearrange your life so that they apply to you.
Unfortunately, young single high income people are not treated very kindly by the tax code. If you have a mortgage, a spouse, and a few kids, with more of an average income, you'll have all sorts of tax breaks.
Good luck.