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The best source is what people actually ask. Take the twenty most common contact reasons from a month and write those, in order.
Do not start from a product feature list. That produces documentation of what exists rather than answers to what confuses people, and the two overlap less than you would expect.
People arrive at an article from a search, not from the top of a manual. Titles should state the question, and the answer should be in the first sentence.
One question per article. An article covering six related things is found for none of them, because it matches nothing precisely.
The twenty most common contact reasons from a real month, in order.
One question, answered in the first sentence. Six things in one article is found for none of them.
Rot. A confidently wrong article is worse than a missing one.
Half an hour with your own data usually saves reading three of these. The guides will still be here afterwards.