Congratulations on the purchase of your first home! Very exciting!
Regarding your itemized deductions , you are correct that you can deduct mortgage interest ( capped at 750K principal) and property taxes ( capped at 10 K)
Regarding the closing costs and improvements made to the property, you cannot deduct them when you purchase the home but keep these with your tax records because when you sell your home, you can add these to the "cost basis" of the property and reduce any taxable gain you may have at that point.
https://turbotax.intuit.com/tax-tips/home-ownership/buying-your-first-home/L5QxJLcQT
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