An article that still answers a real question is worth keeping. Details inside it go out of date: a default setting, a version number, a screenshot. Updating it is usually better than writing a new one that says the same thing.
Change the parts that are wrong
Read the piece as if you landed on it today. Mark every claim that is no longer true, then fix those sentences. Leave the parts that are still accurate. A full rewrite often throws away a structure that already works.
Keep the promise of the title
If the title says the article is a checklist, the update should still be that checklist. Readers and search results both expect the page they open to match the title they clicked.
Note what you refreshed
A short line near the top — what changed, and when — tells a returning reader they are not looking at the same draft. It also reminds you, next time, which sections you already reviewed.
Set a reminder for the articles people still open. A calm edit twice a year keeps them trustworthy.