In this project you will build a bench power supply from a Computer power supply. It's the cheapest way to get a DC power supply for most Arduino type projects.

An inductive sensor can detect metallic objects without touching them. 

You have built an Arduino on a breadboard but you need to program it. How do you do that? This article explains how to get your code on a bare Atmega328P chip so you can use it as if it was an Arduino UNO board.

Wire cutters are generally used to cut metal wire. Some have coated grips that ensure that you will not get shocked by electrical wires you're working with. Slanting cutters have intersecting jaws that cut the wire at an angle, leaving a flat tip.

Wire strippers are a special kind of plier used to remove the insulation from electrical wires.

A resistor is a passive two-terminal electrical component that implements electrical resistance as a circuit element. Resistors act to reduce current flow, and, at the same time, act to lower voltage levels within circuits. Every resistor has a specific electrical resistance which limits the flow of electrons though a circuit. A resistor can be compared to a valve or tap in a water line. The more you close the valve, the higher the resistance and the less pressure there is and the less water flows.