Preparation : Prepare your workspace. Find your soldering iron and your solder wire and start heating the iron. You can read about soldering tools and how to choose a soldering iron here. Clean the tip : When the iron hot, start with cleaning the tip to remove old solder from it. You can use a wet sponge, a copper scouring pad or something similar. Tinning the tip : Before you start soldering, you should tin the tip of the soldering iron. This makes the tip transfer heat faster and thereby making the soldering easier and faster. If you get any droplets of tin on your tip, use a sponge, a copper scouring pad or just shake it off. How to solder two wires : 1. Start with tinning the two wires. It is useful to have something to hold one wire for you. 2. Place the tip of the iron on the wire and let it heat for a second or three. 3. Then add some solder until the wire is soaked with solder. If it is a thick wire, you should turn up the heat on your iron (if possible) to make the wire heat up faster. Repeat the tinning process on the other wire. 4. Now place the two tinned wires together and hold still while heating them with the soldering iron so that the tin on both of the wires melt together. Soldering on a PCB : 1. How to solder through-hole components on a PCB starts by placing the part in its hole. Bend the leads of the part so that it stays in its place. 2.Put the tip of the iron on the pad so that it heats both the lead of the part and the pad of the circuit board. Heat them for a second or so before you apply solder. Remove the iron and the solder wire and inspect your solder joint to see if it looks okay.