DIPLOMA IN GRAPHIC DESIGNING IS 1 YEAR course which helps one to develop creative skills, on completion of this course you will be able to make graphic images and layouts, logo for many products and you will learn typography,  3d designing , fine art, multimedia skills and many more.

To know more about this course, check the following page,

"Diploma in Graphic Design Course, Subjects, Colleges, Syllabus, Scope, Fees, Eligibility" https://www.careers360.com/courses/diploma-in-graphic-design

Hope this helps.