I what on to channel 806 on my sky q, by mistake few seconds and then I what back on to channel 501 sky news hd so will it effect my hd channels on my sky q

No, briefly tuning into channel 806 (which is typically a standard definition channel for Sky) and then switching back to channel 501 (Sky News HD) will not have any lasting effect on your HD channels or your Sky Q box. Your viewing history or brief channel tuning won’t impact your HD subscription or the functionality of the HD channels. You should continue to have access to all your HD channels as normal. If you experience any issues, try restarting your Sky Q box.