Thank you!! I have actually googled sheldon brown already, I just wanted a somewhat more "layman" explanation. That makes sense.

A few more
How do you adjust BB length? Adjusting the crank requires spacers or "stack bolts" correct? Can I buy any crank as long as it has the crank arm length I want and work with that?

I'm glad my thoughts were right about the crank arm length. It makes sense to have a shorter length, especially for more reckless riding

Thanks again!