There are many myths about the brain in general in this case how it functions and whether or not you are able to learn new things and or if you are even good at something. Although, some people might say they aren't good at a particular thing so they have that negative mindset that they will never be good at it. In addition to this at said in “You Can Grow Your Intelligence” Your brain is like a muscle the more you put it to use the stronger it gets. For example, I always had the set mindset that I was never really good at math at all even if my life depended on it. When I was in my last two years in highschool I thought for sure I wasn’t going to pass my math class my junior year and I was right. Consequently I had to retake that math again
