Do I need to provide receipts of gamble losses I deducted ? I have all the receipts but Turbotax didn't ask for them for filing.

You do not have to attach your gambling loss documents with your tax return.  Keep them for your records in case the IRS ever asks for them.

Gambling

To enter the W-2G  or other documents For your Gambling winnings--Go to Federal>Wages & Income>Less Common Income>Gambling Winnings

You can enter your winnings, and then keep clicking through the interview to enter gambling losses.

https://www.irs.gov/help/ita/how-do-i-claim-my-gambling-winnings-and-or-losses

Gambling winnings are taxable income.  Losses are an itemized deduction.  If you do not have enough itemized deductions to exceed your standard deduction, your losses will have no effect.

https://blog.turbotax.intuit.com/income-and-investments/how-are-gambling-winnings-taxed-8891/

https://ttlc.intuit.com/questions/1900352-can-i-deduct-my-gambling-losses

2019 Standard Deduction Amounts

Single $12,200   (+ $1650 65 or older)

Married Filing Separate  $12,200   (+ $1300 if 65 or older)

Married Filing Jointly $24,400   (+ $1300 for each spouse 65 or older)

Head of Household $18,350  (+ $1650 for 65 or older)

if I don't file my gambling winnings, what happens?

@jtarver852 You can only report Gambling Losses up to the amount of Gambling Winnings.  You would need to report your Winnings if you want to claim your Losses.

Click this link for more info on Reporting Gambling Losses.