Creating and using VLANs for gaming

Hello everyone, I'm a beginner in OpenWRT, how can I create a VLAN for games?
What is the best configuration and tips?
Does the use of VLANs have significant advantages for online games like Call of Duty?

While I'm not the one who can comment on gaming related optimizations, I can say that VLANs are not necessarily relevant here (although it might be useful). What you really need is traffic shaping / QoS to control buffer bloat, and potentially also to prioritize traffic from your gaming machines over other devices that may consume significant bandwidth. Buffer bloat methods apply to the upstream (wan) interface, so VLANs don't play in here. But, if you have a few devices that need prioritized bandwidth (while others should be de-prioritized/limited), that would be a situation where VLANs might be useful.

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thanks for your reply, how could i create a VLAN?