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I would add that you never want to leave the tip un-tinned. This causes oxidation (immediately) and can affect the performance as well as cause issues the next time you use it. This is very specifically why some people tend to have issues getting solder to stick to the tip or end up with dirty solder.This tutorial is an overview, there are many many more tips you can learn to take your soldering from beginner to very good and trustworthy.