I've come across it before, but haven't really used it. It looks like the examples are pretty good. I however dislike how it is organized as it organizes by first letter of a title (that seemingly has no pattern for first words making finding a particular entry harder) and doesn't have different categories or tags to categorize the different types of tasks. Organizing by type of task would have been a nice feature for browsing the code I much rather enjoy the layout of the linked github as it's much easier to study a particular topic.