Need for more explanation, compare, contrast of storage terms and choices between block, filesystem, lvm, local, etc.

easy, assume no deep knowledge yet of OCP storage options, terms, technology

1. pretend you don't know everything about OCP and storage. 
2. Read our docs. 
3. You won't understand exactly when and why you'd choose lvm vs local storage
4. you wouldn't understand exactly when and why you'd choose block vs filesystem storage 
5. it'd be great to also go further and have a table showing at least a basic compare and contrast of storage options like the above plus iscsi, nfs, etc.

our docs DO NOT actually help me understand why or when I'd choose various PV storage setup options

our docs would actually help me understand why or when I'd choose various PV storage setup options