If it requires power, you need to know how much, what all the pins do, and how to hook it up. You may need to reference datasheets, schematics, and know the ins and outs of electronics.
Skill Level: Noob - You don't need to reference a datasheet, but you will need to know basic power requirements.
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When creating small circuits on a solderable breadboard I'll often attach 2 header pins in order to connect up a power source. I then use this to quickly attach a power source.