There are certain things I definitely did not get in the beginning. But after working very hard I got them. I am curious what percentage can make the jump as I

There are certain things I definitely did not get in the beginning. But after working very hard I got them. I am curious what percentage can make the jump as I did. Clearly there are certain "epiphanies" to be had. I almost immediately understood "for" loops, but took several years to get pointers and polymorphism each. I know of people who get some or all of these concepts instantly. There is clearly the appearance of bimodality here, even in just my experience with just how I learned things.