How To Install A Faucet
Part 1: Looking at your faucet... surprise!
Depending on the day and my supply of aspirin... getting under the kitchen cabinet can be the hardest part of the job! Oh for a shrinking pill (Go ask Alice... I think she'll know)!
This is not the only possible configuration you may see. Some upper-crust faucets have physically separate spouts and shutoffs. Others utilize combination mounting bolts and inlet nipples... short threaded pipes that do "double duty".
Here are drawings these three common types...