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What are the most important things to know about a scuba diving certification course?
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The most important things to know about a scuba diving certification course include: 
1. What type of certification you want to obtain, such as recreational or professional.
2. How long the course will take and what materials will be provided.
3. What kind of training is required for certification.
4. What equipment you need to bring with you on your certification dive.
5. What certifications you must have before taking the course.
6. What medical requirements you must meet before participating in the course.
7. What safety procedures you must follow during the course.
8. What special considerations you should make when selecting a certification program.