Most of the time reading for the reasons others have stated(scannable, copy examples, etc). That said, there are times where I read something a number of times

Most of the time reading for the reasons others have stated(scannable, copy examples, etc). That said, there are times where I read something a number of times and the concept still doesn't click. In those instances a short video of just that specific concept is great. Short, hyper-specific screencasts are useful where exhaustive videos are not as much (to me).