I am still learning PHP and I could use info on what are the most common usages / applications of $_COOKIE in the most common types of scripts like cms / blog / tube / forum / online store. I know how cookies work, but these actual applications (maybe like 10 or more) would be what I would actually need and then use the info for practicing it.

I basically need to “uncover” $_SESSION and $_COOKIE more, these actual usages of it, applications, in procedural PHP.