I have over $3000 in items I donated to charity. What's the best way to account for them? And, how does the software allow me to do that?

You can itemize the deductions using It's Deductible. You can also enter cash donations there as well. See: https://ttlc.intuit.com/replies/3301739

To itemize without using It's Deductible, see: https://ttlc.intuit.com/replies/6225225

Finally, for info on Itemized versus Standard deduction, see: https://ttlc.intuit.com/replies/5788312