Cams for Dummies ??

I would like to understand how to pick a cam, and how all the other factors affect selecting the right cam. I'm not an idiot but just reading what I can find here it's like the harder I try to get it the less it all makes sense.

Is there a good book, website, or tutorial I can use to get a handle on this?

TIA!
man, talk about deep murky waters.

the one constant you'll find is that everything affects cam selection. every.single.factor.

the more you read, the more you'll find you knew a lot less than before.

it's called camshaft theory for a reason...