What does the English slogan mean by lowercase after comma?

The beginning of a new sentence or meaning group.

According to English writing rules, commas are used to separate different sentences or phrases, and the first letter of a new sentence is lowercase. Follow English grammar rules. In English, commas are used to separate different components or phrases in sentences and to list or insert information. According to grammatical rules, when a comma is followed by a lowercase letter, it indicates the beginning of a new sentence or meaning group.