Recommended
How to Make a Shunt Current Sense Resistor
Why people recommend it
An ElectroBOOM video on building a shunt to measure large currents, recommended as an entertaining way to learn safe high current measurement.
Watch for: Comedy style; suggested as suitable for younger viewers too
In their words
If you don't have one to hand, it may be tempting to use Mehdi's video on how to create one using a wire, but when using a breadboard or perf board, you'll probably get undesirable results.
Nick Bolton on electronics.stackexchange.com, Jul 2022. CC BY-SA.