Wifi channels
This is because in a crowded environment, there is a very high chance of neighbor interference, which can take the form of co-channel interference, where multiple routers APs connect to the same channel so they are forced to take turns – meaning only one device can use a certain frequency at a time. Or, in the worst case, channels merge with each other, causing interference on adjacent channels. This either makes Wi-Fi very slow or completely unusable.
In terms of channel bandwidth, use 20 MHz in the 2.4 luxembourg telegram data GHz band because it has more non-overlapping channels. At 5 GHz, you have a little more freedom of choice, but the general consensus is that 40 MHz channel bandwidth should be adequate for a residential home with multiple Wi-Fi networks.
This way, you won't interfere with other access points as much, but you'll still get decent throughput - yes, it will be less impressive than with an 80MHz or 160MHz channel bandwidth, but at least it will be stable.
Since the idea isn’t to show off your new wireless router to your neighbors, but to ensure reliable Wi-Fi throughput, reduce the transmit power on the 2.4 GHz band. This is one of the cardinal sins of router manufacturers, as the transmit power is usually set to maximum on both radio bands. I’ve found that it’s best to keep the transmit power on the 2.4 GHz band low and boost the transmit power on the 5 GHz band.