Hi David!
Hope it's your name, well my inquiries are about the way you speak so fast in videos; it's quite difficult for non native English speakers like me. It'd be easy for a native English speaker to understand your courses but not for a non native one.
Above all, the way you play on the pronunciation of words; your accent.

So if you don't mind please try to speak a little formal, I mean without playing with the way you're spelling words and less fast.

You may forgive me if I wrote something and it sounds rude to you, it wasn't my intention.
Thanks!