A useful FAQ answer resolves the question clearly, then explains the context a reader needs to act on it. Lead with the answer when that helps comprehension, define unfamiliar terms, and add evidence or an example for claims that need support. Distinguish facts from recommendations and avoid exaggerated promises. The answer should remain understandable when someone encounters the section without reading the entire page.
Use the length and format the subject requires. A cost question may need ranges and scope assumptions, while an implementation question may need steps and links to documentation. Google does not prescribe an ideal page length or require content to be broken into tiny chunks. Clear question headings and concise openings are editorial choices that help readers; they are not a special syntax that forces an engine to quote your content.