I what on to channel 806 on my sky q, by mistake will it effect my hd channels on my sky q

No, changing to channel 806 on your Sky Q will not affect your HD channels. Channel 806 is typically a standard definition (SD) channel, but switching to it is purely a temporary action. You can easily switch back to your preferred HD channels without any impact on your system or settings. If you have any specific concerns or issues with your Sky Q, feel free to ask!