"Garantiert Zeichnen Lernen" (Drawing on the Right Side of the Brain) by Betty Edwards is widely considered the "gold standard" for anyone who believes they "can't even draw a stick figure."
If you want to dive deeper, you can find the latest edition at major book retailers like Ernster.
💡 : The goal isn't just to make "pretty" art, but to learn a new way of seeing the world around you.