What is your favourite free online tutorial about sketching using pencils?

Hello! I am designing a website as a college assignment. The website is about Pencil Sketch Tutorials. I am going to link it with a Facebook page where people will be able to find even more tutorials and links about drawing courses.
What are your favourite tutorials? I want to get some suggestions so I can contact the creators to see if they’ll let me share them on my FB Page. If you have any works that you’d allow me to share too, that would be great!