- 1 – 3D printing and modeling
- Action figure and toy collecting
- Affiliate marketing
- Anti-aging
- Antique book and manuscript collecting
- Antique furniture restoration
- Antique jewelry appraisal and collecting
- Antique pottery and ceramics
- Aquaponics and hydroponics
- Art and drawing techniques
- 11 – 21 – Barbecue and grilling techniques
- Beekeeping and honey production
- Bonsai tree cultivation
- Board game creation
- Career development and job hunting
- Classic car restoration
- Collecting rare coins and currency
- Collecting vintage vinyl records
- College admissions and test prep
- Computer programming and coding
- 21 – Cooking and meal planning
- CrossFit and high-intensity training
- Dance and choreography
- Dating and relationships
- DIY electronics and robotics
- DIY home improvement
- Dog breeding and genetics
- E-commerce and dropshipping
- Energy-efficient home design
- Feng Shui and home energy
- 31 – Finance and investing
- Fishing and angling
- Game development and design
- Gardening and landscaping
- Graphic design and Photoshop skills
- Health and wellness
- Health coaching and nutrition planning
- Hiking and backpacking
- Holistic-Healing-and-Alternative-Medicine-by-Dennis-POLISHED
- Home automation and smart technology
- 41 – Home brewing and distilling
- Home organization and decluttering
- Home theater setup and design
- Home based business ideas
- Home based business strategies
- Interior design and home decor
- Investing in cryptocurrencies
- Investing in fine art and antiques
- Investing in real estate
- Kombucha brewing and fermentation
- 51 -Language learning and language acquisition
- Mental health and stress management
- Mindfulness and meditation
- Mobile app development
- Mobile photography and editing
- Muscle building and bodybuilding
- Music theory and instrument tutorials
- Niche hobbies and collectibles
- Online marketing and entrepreneurship
- Outdoor photography and wildlife photography
- 61 – Outdoor sports and activities
- Paleo and keto diets
- Parenting and childcare
- Passive income strategies
- Personal branding and social influence
- Personal development and self-improvement
- Personal finance and budgeting
- Personal safety and self-defense
- Pet care and training
- Photography and photo editing
- 71 – Productivity and time management
- Public speaking and communication skills
- Real estate investing
- Remote work and freelancing
- Robotics and automation in industry
- Soap making and skincare products
- Social media marketing
- Sports memorabilia collecting
- Stand-up comedy
- Stock trading and day trading
- 81 – Survival and prepping
- Sustainable energy solutions
- Sustainable fashion and ethical shopping
- Sustainable living and eco-friendly practices
- Tennis and racquet sports
- Travel and adventure
- Travel hacking and cheap travel tips
- Urban farming and rooftop gardening
- Vegan and vegetarian cooking
- Vintage fashion and collecting
- 91 – Vintage watch collecting
- Virtual reality and augmented reality
- Wedding planning and event coordination
- Weight loss and fitness
- Wine and beer making
- Wine investment and wine collecting
- Wine tasting and appreciation
- Writing and publishing
- Writing fiction and novels
- Yoga and meditation