Thank you for this comment. To anyone writing tutorials, I salute you. It is a difficult job and extremely important one. Keep doing that and all humans who genuinely share their knowledge deserve all the riches in the world! And we all have something to share. Only that 'quality teaching' you mention is often wasted on very distracted and easily excitable masses. But as any teacher/parent/educator/coach/councillor knows, their work brings harvest sometimes when their bones turn white... few go into teaching to 'get rich. quick.' ha ha!