A chapter marker sends a listener to a particular point, so its title should match what begins there. A clever label is less useful if the promised discussion starts several minutes later.
Create markers from the final or nearly final edit. Start by identifying clear changes in subject or format, then replay the first moments after each candidate timestamp. Avoid placing a marker halfway through a sentence unless the format specifically requires it.
Use titles that distinguish the sections in ordinary language. “Choosing a location” tells a listener more than “The big question” when several chapters contain important questions.
After any edit that changes timing, recheck the markers. Copying chapter times from an earlier export can send listeners to the wrong passage even when the text remains accurate.
Test at least one marker near the beginning, middle and end in the actual delivery format. Platform support can differ, so verify the experience where you intend to publish instead of assuming a correct text file guarantees correct playback.
Keep spoilers in mind for narrative work. A descriptive label can orient the listener without revealing a later answer. Good chapter navigation makes an episode easier to return to while preserving the listening experience it was designed to offer.
Image: an editorial illustration, not a documentary photograph.