MarkMilward Decent advice but that's only the case if you have 802.11g enabled on the AP. The shoulders (sidebands) don't overlap if you only enable 802.11n/ac/ax.
That's why it is in theory possible to have 1, 5, 9 & 13 in use with 20MHz bandwidth.
In practice of course some idiot will inevitably have chosen to use something like channel 7 with 40MHz bandwidth - German cars (VAG/BMW) are appallingly bad for effectively destroying 2.4GHz usage for anyone nearby by doing the above so channel selection won't help if a neighbour has one of these. Directional antennae are all you can do to mitigate the interference.