My traditional IRA and Roth IRA are all through my employer. Do I still need to enter it under deductions and credits?

I did not contribute to an IRA outside of what was done by/through my employer which is already posted in box 12 of my W2.

Retirement tax questions

No.  Only enter it from the W2.  It's probably not a IRA but a 401K or 403b plan.

Retirement tax questions

If your contributions to the IRA's are entered on your W-2 then you do not enter them anywhere else on the tax return.