Question Things I need to know before buying a new monitor ?

[TO4]

Hello,

Im buying a new 32" gaming monitor.
Replacing my 11 year old 27" LG because its flickering during gaming.
Im looking for 1440p monitor.

And Im kinda CONFUSED about couple of things.

1. FreeSync vs. G-Sync diffrence between those two (i have nvidia 3070 ti do i HAVE to buy a monitor which supports NVIDIA G-sync or it doesn't matter????)

2. HDR what is it for? Can i use it in gaming (diffrence HDR 400 vs. HDR 1000?)

3. VA VS. IPS ????

4. Do i need more than 165HZ display (i only play WAR THUNDER and occasionaly INSURGENCY Sandstorm)

5. OLED is too expensive for me do we have a best BANG for BUCK option?

Would you be so kind and point me in the right direction this is what i have available in my store nearby:
https://www.e-misija.si/monitorji?filter_diagonala-zaslona=32-x,31-x&query_type_diagonala-zaslona=or



Thank you and have a nice day
TO4