My watch shows the time and a lightning bolt. It won;t do anything else.
My apple watch only shows the time and a lightning bolt.
Question marked as
Top-ranking reply
If your watch is showing "time and a lightning bolt" then it probably is in "power reserve mode", when your Apple watch is in this mode you should probably charge it.
Check out this article for more info about charging and power reserve.
Check your battery and charge your Apple Watch – Apple Support (UK)