You can use it to protect your hand while drawing or protect your paper from your hand, your oils and things like that. It's safe to put it on the top of the paper because since it's waxy, it's not going to pick up your charcoal or graphite and it's not going to smudge your drawings.
This is a list with all my favorite drawing supplies for beginners. If you want to get started with drawing but don't know what to buy, this list should help you decide what the most important items are.
Remember, you don't need to buy all of these supplies right away. Rather see which supplies might solve any issues you run into in your journey of learning to draw (for example, one issue may be that you are constantly smudging messy media like graphite or charcoal on your hand, and the answer to that may be to buy a big pad of wax paper to protect your paper/hand with).
Start out with the essentials and then branch out from there!
For further reviews or to see these products in action, check out my Youtube Channel , Patreon , and Skillshare !