When you buy a router, What do you do .....

Let's say you bought a router, and installed it... what would you do with the settings to get the best online gaming experience?

Like setup static Ip, DNZ and other things... Technical stuff that the average doesn't know... or do you just take it out of the box and install it

Make sure uPnP is enabled. And usually it's on by default...so you shouldn't have to do much.

I'm not sure if it's still the case. But, if a router has a Turbo mode, I make sure it's enabled.

Set-up a custom DNS, so I can get ANY Netflix worldwide and turn on QoS to prioritise gaming traffic.

QoS is the most important thing to setup.

Redundant for many, if not most. Unless you're providing a family or a group of people internet, I can't imagine why you'd need to prioritize any traffic.

Bufferbloat

If you are maxing your connection, your web browsing/gaming performance will be pretty bad generally. With some types of QOS you can alleviate it, although most built in QOS algorithms are pretty bad. If you put openwrt on you can use fq codel which is very good, and later cake will be an option, which is even better.

Maybe I'm wrong but I just don't think it's common that people max their connection when playing games. Maybe vital if you like to torrent + game but unless you share your connection with a bunch of people I find it's very unlikely that most people would benefit noticeably from QoS.

Not saying people shouldn't do it...but the most important thing? Maybe in some situations but probably wouldn't apply to most.

Yeah I agree it's not that important, just nice to have.

If I'm downloading from Steam, my web browsing sufferes.

A game will -never- max out a connection in terms of bandwidth consumption because the payload is designed to be as small as possible, but nearly anything else can. Video streaming from services like Netflix, Windows or Steam automatic updates, etc. If you have even one additional device in your house that might be going at the same time as when you are gaming it's potentially an issue, even if that device isn't actively being used by another person.

To the op's question, wireless speed and range are the two biggest factors, basic PAT, and it has to support uPnP. Everything else is secondary, and even optional. DHCP I can run off of any Windows Server (and half the time I do). DNS is handled by my domain controllers because otherwise my domain won't work. NAT I can do through my PFSense router, which is running on a VM in a host that has multiple NIC zones with one directly connected to the cable bridge. QoS is nice but unless you shell out a lot of money for your router then the QoS you get with the router might be crappy/limited, so again any *nix or BSD based router app is free and a better way to go (but if the router's capability is good enough, no reason not to use it).

I got this beast: https://www.asus.com/us/Networking/RT-AC5300/

I got this one specifically because it had the best range and speed in practical testing (installed in the basement it covers my whole house very well), it had all the features I might want, and it's triple band (two 5ghz and one 2.4ghz). Now all the video streaming devices like Rokus and FireTVs are on one 5ghz network and my gaming devices are on the other, so I can even use Steam Streaming at the same time without any impact.

-Byshop