I am trying to charge my watch but it gives me pictures of charger with red bolt d even after charging for hours still I face the same? How i can charge it please?

Which Apple Watch model do you have?

Has the battery ever been replaced?

Are you using the original Apple Watch charger and adapter?

If yes, and your watch is still not charging, you will have to get it serviced:

Apple Watch Service & Repair - Apple Support

If you are not using the original Apple Watch charger and adapter, this can be a reason for the watch not charging.

This is the only way to rule out a hardware issue.

I suggest testing with a different (known good) power adaptor and charging cable. A simple test by substitution will eliminate the easy fixes.