Say what you will about scratching, and I will probably echo your sentiments, but I respect anyone who wants to teach their craft!
Or at least I try really hard too, and I'm glad I did in this case! MastaHanksta starts off like some cheesy Gansta-Dudebro, but then he calms down into a practical explanation of scratching basics; complete with a practice exercise.
The iDJ Live is under $100, so this is a very affordable way to try scratching before investing in $1000+ Technics. MastaHanksta plans on continuing this as a series of tutorials, so if you're interested you should check out his YouTube channel, DJ Scratchdog.