High quality, fairly expensive soldering equipment is available at Omega Verksted. Please be careful with it, and ask a board member if you are unsure about something.
Soldering is a method for chemically joining items using heat. There are many types of soldering, but by far the most common is using a tin alloy to join copper parts. This is a staple of electronics manufacturing, and the focus of this article. The "Basics" section will give you some very condensed core insights to get started with soldering without missing important information.
See also: Soldering Equipment
Advanced
Although the following information could be useful for a beginner as well, you shouldn't be too concerned with it if you are just starting out. Soldering is the best way to learn soldering.