• GMPs are normative claims about what ought to be done, or should not be done, etc. [not, e.g., claims about what happens]
• GMPs are moral claims [not, e.g., legal, prudential, or aesthetic]
• GMPs are general and don't mention specifics
• GMPs can be highly qualified [i.e., have lots of exceptions (general exceptions) built in]

Examples:

It is wrong to kill innocent persons without their consent.

If one makes a promise, one should keep it.

One should not attempt to get someone to have a false belief by asserting something that is not true.