Chargers
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How to Test a MacBook Charger Without Extra Hardware
You can test a Mac charger with what macOS already provides: System Information's negotiated wattage, the power log, and a day of observation. Here is the method.
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MagSafe or USB-C: Which Should You Use to Charge Your MacBook?
MagSafe 3 and USB-C charge the same battery through the same negotiation. The real differences: 140W support, the breakaway magnet, port count, and cable wear.
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How Many Watts Does a MacBook Charger Need?
Every current MacBook charges over USB-C. Here are Apple's adapter wattages, which Mac needs which, what happens with too few watts, and how to see the watts you really get.
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MacBook Not Charging? Find the Broken Part Step by Step
A MacBook that won't charge has a fault in one of five places: socket, plug piece, cable, charger, or port. Here is the elimination method that finds the guilty one.