Tutorial for using a basic theme?

Okay, a beginner here.
I have found it difficult to locate a practical beginners tutorial of a basic/common/newer free wordpress theme to practice with. My eyes are bug-eyed searching through them.
Most (seem to be) easy, but I am one of those that need a little extra to break the learning-curve.

Question:
Does anyone know of a great simple tutorial using a basic/common WordPress theme, preferably within the E-commerce field, that actually ends up like the tutorial shows?

Any help is greatly appreciated.