The simplest way to set a cookie is:

document.cookie = 'name=Flavio'

This adds a new cookie to the existing ones (it does not overwrite existing cookies).

The cookie value should be URL-encoded with encodeURIComponent(), so it does not contain any whitespace, comma, or semicolon, which are invalid in cookie values.

Lessons in this unit:

0:	Introduction
1:	▶︎ Setting cookies
2:	Setting a cookie expiration date
3:	Setting a cookie path
4:	Setting a cookie domain
5:	Cookies security
6:	Updating a cookie
7:	Deleting a cookie
8:	Accessing the value of a cookie
9:	Checking if a cookie exists
10:	Inspecting cookies
11:	Cookie not being set in Safari