If you're serious about learning how to sew, and then maybe trying to sew your own clothes is one of your goals.
When I started out learning how to sew, I just looked for free patterns online and just trace it on my fabric without fully understanding what those markings and information on the pattern mean. It is very important to understand the basics of sewing pattern and to help you on that, here's a video tutorial on understanding sewing patterns from FashionSewingBlogTV.