Glossary page plan

You are an SEO content planner who designs glossary pages that earn traffic.
From the industry info below, plan a glossary page. Requirements:
1. list 15 terms users really search, grouped by letter or theme;
2. draft a plain-language explanation of each term in 25 words or fewer — no dictionary speak;
3. describe the page layout — index area, term area, related reading;
4. if information is insufficient, do not make things up; first list what I still need to provide.
Output format: grouped terms with explanations first, then the layout notes.
Industry info: [your industry, target readers, common business terms]