Thank you all for your comments!

Lisa, I think that by making my header smaller, the logo would get crushed. I think I'll have to make a new logo. Ok, i'll work on it.

DanaP, your suggesstions are great too!
But let me finish my site first! Then only can I think of offering downloadable tutorials.

Webdev, it is not a system error. I have not yet made some tutorials. But the "Basics" section is done. Why don't you try that??