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Documentation, tutorials, training, user guides, installation guides, design documents, and all other types of technical documentation in any domain (not just software).
3
votes
Section headings: "to check..." vs. "checking"
The accepted answer is correct of course, but I want to add that you can also use the "How to" construction:
4. How to check whether a key exists
5. How to retrieve a value
6. How to check whether var …