how do i make hp bar?

how do i make an hp bar i tried to make one with animations but it didnt work! please help!
p.s. im bored!
p.p.s. i have no idea why i posted the other p.s.
p.p.p.s. i stayed up all night!!!
p.s. im bored!
p.p.s. i have no idea why i posted the other p.s.
p.p.p.s. i stayed up all night!!!