What is the most common way of making an electrical connections?

Answer 1

The most common way of making an electrical connection is with a device called a wire nut. Solid wire connections should be twisted together with a pair of pliers before installing the wire nut to hold the splice tight. Twisting stranded wire together with a pair of pliers does not allow the wire nut to grip the wires as tight as it should. Stranded wire should be held together side by side (in parallel) and let the wire nut twist the wires together to make a solid splice connection.