Freelancers largely live and die by referrals. Their future work tends to come from people who heard good things about their efforts from previous clients. Most people understand this concept and, unfortunately, there are more than a handful who attempt to exploit it.
Sooner or later, likely later given that I currently can't draw to save my soul as you'll see in a moment, I intend to offer logo design services to my future clients. An introductory Udemy course that I took on the matter pretty much hammered in the nail of Adobe Illustrator as the "logo app".
I was recently out with a friend who mentioned that one of his larger concerns surrounding at least testing the freelance waters by taking on more direct positions with potential clients was his concern about making mistakes. That's not to say that mistakes weren't made by him as it was, but because