Those shutoff valves under your bathroom vanity or kitchen sink can seem intimidating to replace, but the process isn't that difficult. There are different types, including Shark-Bite style, compression style and the sweat-on or "soldered" style. The last one can make DIYs nervous, but in this video I will go through the steps and make it easy. Sweat-on valves are durable and can be replaced in the future with ease. When I do a bath or kitchen remodel, I replace them as a matter of course, since they tend to fail with time. You can sometimes just replace the washer, but if the seat is corroded that will have limited effectiveness. I prefer to replace the whole valve and start fresh.
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https://amzn.to/3fRWHJU (Bernzomatic torch trigger)
https://amzn.to/3dMFYVH (Copper pipe wire brush)
https://amzn.to/3s2u5QE (Emery cloth sandpaper)
https://amzn.to/2Q8MSfU (Solder and flux paste)
https://amzn.to/3wJZHy0 (Sweat-on valve for 1/2 inch pipe)