how pond5 templates work ?

Are the templates useful when u want edit data of similar videos ?

Example : If I have 8 clips with same subject , I do a template to put same title , description , keywords in it ?

You don't have to fill in all the fields of the template, you could leave the title out, I find templates useful for a shoot in the same town or camera. So yes templates are useful for multiple files.

Could more clips of the same subject have thesame titlename ,description or keywords ?

Yes