DITA2Go bases starting points for DITA topics on the occurrence in your document of paragraph formats that have certain configuration settings. By default, DITA2Go also treats the very first paragraph format in each file as the start of a DITA topic.
§24.8.1.1 Identifying starting elements for non-glossary topics
§24.8.1.2 Identifying the starting element for glossary topics
§24.8.1.3 Preventing the first paragraph format from starting a topic