One could purchase guitar instruction books at one's local bookstore or music store. One could also rent a guitar instruction book at one's local library.
Most golf courses have instruction classes you can take. You can also take a golf instruction course at your local community college.
Possibly at your local appliance parts store, or online.
That would be called a "procedure" or a "work instruction."
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A customer may locate an instruction manual for a branded rotisserie by going to their local library and reserving an instruction manual on the subject. Or one may go to amazon and buy a manual for one's self.
The input devices receive the instruction from the user, which is then fed into the processor. The processor then executes the instruction and displays the result on the screen or other appropriate output device.
To make proficient by instruction and practice as in some profession or work
Not on-line. Call, or go the local DMV office.
The husband in "The Necklace" worked as a clerk in the Ministry of Public Instruction.