Researching The Basics Of Process Mapping

I really need to learn more about The Basics of Process Mapping.
My boss is convinced that process mapping and business mapping can help improve our efficiency.
So I’ve been reading up on Process Mapping Flow Chart online. There’s a lot of good info out there, but it’s tough to know where to focus.
I learned about flow charts in computer class, so process maps haven’t been too tough to pick up, at least.
Maybe your comments will help settle it.