Is HCl(aq) + NaOH(aq) = H20(l) + NaCl(aq) a redox reaction ? if yes show how the oxidation states change?

HCl(aq) + NaOH(aq) → H₂0(l) + NaCl(aq) is NOT a redox reaction.

This is because there is no change in Oxidation state.
Oxidation state of H before reaction = Oxidation state of H after reaction = +1
Oxidation state of Cl before reaction = Oxidation state of Cl after reaction = -1
Oxidation state of Na before reaction = Oxidation state of Na after reaction = +1
Oxidation state of O before reaction = Oxidation state of O after reaction = -2

Go through each substance and use the rules you need to know to assign oxidation numbers to each element. Do any of the oxidation numbers change? If not, then it isn't a redox reaction. Some of the most basic rules are:
1. H in compounds is nearly always +1 (there are a few exceptions)
2. O in compounds is nearly always -2 (again, there are a few exceptions)
3. Group 1 and group 2 metals in compounds are nearly always +1 and +2 respectively.
4. The sum of oxidation numbers in compound and ions is equal to the charge of the compound (0) or ion.