Find a repeated question with an awkward answer
Look at customer questions, sales objections, and work people repeat manually. Ask what would make the task easier: a calculation, an example, a checklist, or a reliable reference.
We would not build a calculator just to put "free tool" in the title. A useful asset needs a clear input, output, and audience, or a clear fact someone needs to reference.
Choose something you can maintain
A pricing comparison becomes misleading when the prices change. A tool becomes frustrating when it pretends to check data it cannot access. An original explanation needs enough evidence for someone else to trust it.
Start with a narrow resource whose assumptions and limits you can describe plainly. The Broken Link Checker, for example, checks a bounded set of links on one public page. It does not claim to discover every backlink on the web.
Add something beyond a summary
A worked example can expose tradeoffs a generic introduction misses. A reference table can make scattered information easier to compare. A small tool can remove a repeated manual step.
Label illustrative inputs and results. Never invent survey responses, customer stories, or product tests to make the resource look original.
Plan its distribution
Identify relevant writers, communities, or partners who already deal with the problem. Explain when the resource is useful rather than merely announcing that you published it.
Review usage and feedback so you can fix actual problems. A resource can be polished and still fail to answer the task people brought to it. Keep the next step appropriate: users should receive the promised answer before encountering a product pitch.