If those cookies are not necessary for operating, like tracking cookies, you have to ask the user before you set the cookie. If you ask, you have to be specific

If those cookies are not necessary for operating, like tracking cookies, you have to ask the user before you set the cookie. If you ask, you have to be specific for what the cookie is used. The checkbox or slider has not to be prechecked. You also have to provide a way to the user to withdraw his consent. And you have to keep an audit trail for the given consent.