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The thickness of the wire should match the size of the components you are joining.

The "all-purpose" size. It works for most through-hole components on circuit boards and general hobby projects.

Sites like Adafruit and SparkFun curate high-quality solder specifically for makers.

Never use this on electronics. It is designed for plumbing and metalwork; the acid will eat through circuit boards over time.

Many pros still prefer 63/37 (63% tin, 37% lead) because it has a lower melting point and flows better than lead-free versions. The Kester 44 Rosin Core Solder 63/37 is often cited by reviewers at Wirecutter as a gold standard for reliable joints.

This is the modern standard for electronics. It is safer for your health and the environment. Options like the Kester K100LD Lead-Free Solder are popular among hobbyists.

The standard for electronics. It’s non-corrosive and generally doesn’t require cleaning after the job.

For plumbing or basic repair kits, Home Depot or Amazon are convenient for quick shipping.