But the tutorials simply ignores the real world use case. Lots of concepts are actually useful for solve problems (even in other language). You need to give th

But the tutorials simply ignores the real world use case. Lots of concepts are actually useful for solve problems (even in other language). You need to give the reader some real world example. A concept dangles in brain without connects to other things won't live too long. You brain is likely to `optimize it out` because it is unused.