Here are 20 popular blogging topics that cover a wide range of interests and niches:

1. Personal Development and Self-Improvement: Topics related to personal growth, mindset, productivity, and achieving goals.
2. Health and Wellness: This can cover areas like fitness, nutrition, mental health, and overall well-being.
3. Travel and Adventure: Sharing travel experiences, tips, itineraries, and destination recommendations.
4. Food and Cooking: Recipes, cooking tips, dietary trends, restaurant reviews, and food-related travel experiences.
5. Finance and Budgeting: Providing advice on budgeting, saving, investing, and managing money.
6. Parenting and Family: Tips for parenting, family activities, child development, and advice for different stages of family life.
7. Technology and Gadgets: Reviews, tutorials, and news about the latest tech trends, gadgets, and software.
8. Fashion and Beauty: Fashion tips, style guides, beauty product reviews, and makeup tutorials.
9. Home Decor and DIY: Ideas for interior design, home improvement projects, and do-it-yourself tutorials.
10. Lifestyle and Inspiration: A broad category that can include a variety of topics like motivation, daily routines, and general lifestyle advice.
11. Career and Professional Development: Offering career advice, job search tips, resume writing, and professional growth strategies.
12. Photography and Visual Arts: Tips for photography, editing techniques, and showcasing your own artwork or photography portfolio.
13. Education and Learning: Providing educational resources, study tips, online courses, and learning strategies.
14. Book and Movie Reviews: Sharing opinions on books, movies, TV shows, and discussing popular culture.
15. Sustainability and Green Living: Tips for eco-friendly living, sustainable practices, and environmental awareness.
16. Relationships and Dating: Advice on romantic relationships, dating tips, communication skills, and love and intimacy.
17. Entrepreneurship and Business: Offering advice on startups, business development, marketing strategies, and leadership.
18. Gaming and Esports: Reviews, walkthroughs, tips, and news about video games, both casual and competitive.
19. History and Culture: Exploring historical events, cultural traditions, and heritage from around the world.
20. Pet Care and Animal Lovers: Tips for pet owners, animal welfare, and stories about pets and animals.

Remember, the key to successful blogging is to choose a topic you’re passionate about and that resonates with your target audience. Additionally, offering unique insights, valuable information, and engaging content will help you build a loyal readership.