Your business expenses go on your Schedule C. If you are using online TurboTax you need to use Premium in order to prepare a Schedule C.
https://ttlc.intuit.com/turbotax-support/en-us/help-article/import-export-data-files/enter-schedule-...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/payroll-additions-deductions/qualify-qua...
https://ttlc.intuit.com/turbotax-support/en-us/help-article/self-employment-taxes/self-employed-expe...
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