Most effective, respected online graphic design courses for beginners?

A collaborative learning community for graphic designers at any stage, focused on education, mentorship, and mutual support. Very much a novice, would like to dip my toes and find a quality online course for beginners that covers rudimentary photoshop, illustrator etc. Currently considering Coursera, Udemy, and Skillshare courses. Any experiences with these? Best reputation of the bunch? TIA!

Content:

Questions about the “Free” Harvard Online Courses.

The goal of r/Education is to provide a community in which educational stakeholders can participate in meaningful, reflective, and thought-provoking discourse about educational policy, research, technology, and politics. Additional Keywords, teachers, students, education I am a high schooler who is interested in branching out and learning new things. I looked at the free courses that Harvard has and I have a few questions. Are the courses actually free or are there some hidden costs somewhere other than the credits? What is the difference between the two different kinds of credits: Free or Verified? Do you still get grades and credits if you audit the course? If you audit the course and don’t get a credit, can you still put that you did the course on your resume?