It doesn't need to be complex or extraordinary. An idea, that lots of people love it, need it, and would like to share it, is a great idea. Sometimes, a very simple or basic idea for a professional could be a great idea for regular people.
Here are some ideas that could be great:
For health section: 1. A healthy recipe which is easy, delicious and economic, and doesn't need a lot of time to prepare; 2. An easy-to-understand guidance of how to prevent and treat a disease; 3. An exercise plan that is easy to execute and most people would like to continue to do it; 4. A simple way to do Yoga, Meditation or other things for better mental health; 5. Other helpful and attractive health related ideas; 6. State-of-the-art health topics.
For wealth section: 1. Ideas about how to best save money; 2. Ideas about how to make a budget and follow the budget; 3. Ideas about how to find jobs and better career development, which helps people to improve income; 4. An easy-to-follow financial plan; 5. An easy guide for investment portfolio management; 6. An easy-to-understand and effective investment method to help people make money in the stock market; 7. An easy-to-understand and effective investment method to help people make money in the real estate market; 8. An easy-to-understand guide for a specific industry small or medium-sized business to start and grow; 9. Ideas about how to achieve FI/RE (Financial Independence and Retirement Early); 10. Ideas about happy retirement; 11. Ideas about tax planning; 12. Ideas about estate planning; 13. Other helpful and attractive wealth related ideas; 14. State-of-the-art wealth topics.
For wisdom section: 1. An easy guide for a primary school student to learn a subject (math, language, science, social study, etc.) in a best way; 2. An easy guide for a middle school student to learn a subject (math, language, science, social study, etc.) in a best way; 3. An easy guide for a high school student to learn a subject (math, language, science, social study, etc.) in a best way; 4. An easy guide for a university student to study a major or field of study in a best way; 5. An easy guide for people to learn a lifelong learning subject or topic in a best way; 6. An easy guide for people to learn how to plan for their education; 7. Ideas about how to help people better understand the world; 8. Ideas about useful learning tools and techniques; 9. Ideas about how to improve learning skills (memory, reading, writing, creativity, etc.) 10. Ideas about how to better do things in life, such as home decoration, storage, cleaning, fix a furniture, fix an appliance, manage relationship, good parenting, make friends, home renovation, prevent rats/ants/insects, make or use tools, install home theater, etc. 11. Ideas about how to live a better life; 12. Ideas about how to solve world problems; 13. Other helpful and attractive wisdom related ideas; 14. State-of-the-art wisdom topics.
For fun section: 1. A list of the best E-games in each genre; 2. Ideas about how to play E-games with lots of fun; 3. A list of the best board games in each genre; 4. Ideas about how to play board games with lots of fun; 5. Ideas about how to enjoy sports with lots of fun; 6. Ideas about how to travel to a city, country, area, or around the world with the best plans; 7. A list of the best fun readings in each genre; 8. Ideas about how to read with lots of fun; 9. A list of the best music in each genre; 10. Ideas about how to enjoy music with lots of fun; 11. A list of the best movie in each genre; 12. Ideas about how to enjoy movie with lots of fun; 13. Ideas about how to play with pets with lots of fun; 14. A list of the best arts and collections in each genre; 15. Ideas about how to enjoy arts and collections with lots of fun; 16. Ideas about how to enjoy life everyday; 17. Ideas about how to improve happiness; 18. Other helpful and attractive fun related ideas.
There could be much more great ideas. Just use your imagination.