Only the ones that are taxable. Since they're all potentially taxable, they should all be entered unless you know for sure they are not.
If taxable scholarship is your only income and it is less than $12,550 (the federal filing requirement), you do not need to file a tax return.
Scholarships that paid for non qualified expenses are taxable. Tuition, fees, books and computers are qualified expenses. If box 5 of your 1098-T is more than box 1, TurboTax will automatically treat the difference as taxable scholarship income unless you tell it differently.
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