In a similar vein, one does not really need to, persay, study design. Simply visiting sites like ThemeForest and trying your best to copy the designs from scratch or by using some of their assets is a completely legit way of learning how to do it on your own.

It's like building a working memory of design that you can pull from when you wish to be creative. Kind of like when you learn to code, you need to look at code examples and you need to eventually write it yourself.