Basics - for beginners
Types of solder
- 60/40 22 gauge (.032") leaded wire solder is the generally recommended standard for electronics - especially for beginners. More experienced solderers tend to have different types of wire for different situations. Stay away from acid core solder (primarily used for plumbing), as this can damage electronics.
- The Practical Electronics wikibook the section on types of solder from discusses the different types of solder. (In fact the entire page on soldering contains useful information.)
How to solder
oneTesla's introduction to soldering. Good basic information for the beginner. 4 min.
EEVblogs' 3-part tutorial on soldering. Very detailed, covering equipment, types of solder, and many other details. Runs about 100min total.