my dog doesn’t stop barking

hi! i live on a loud road surrounded by woods. my dog keeps barking at every little thing and it’s starting to stress me out. all hours of the night and day. i want to help him and try to keep my sanity. if anyone has advice please send it! i’m desperate. he’s an amazing sweet dog roughly 5-6 years old (he’s a rescue so im not sure) thank you so much!