Your niche (market segment) is the single most important factor when starting an affiliate blog. Choose the right niche and you can earn money in your first month. Choose the wrong one and you could write hundreds of articles with zero conversions.
3 Golden Criteria for Evaluating a Niche
1. Commercial Intent
A good niche must have people willing to make purchases. Check: does this niche have enough products or services to review? Are there affiliate programs available? Are the commissions attractive enough?
2. Search Volume
There must be enough people searching to generate traffic. Use Google Keyword Planner or Ahrefs to check volume. Target: the combined volume of the top 50 keywords in the niche should exceed 100,000 searches/month.
3. Competition Level
This determines how quickly you can rank. A Keyword Difficulty (KD) score below 30 on Ahrefs is ideal for new websites.
Top 10 High-Potential Affiliate Niches for 2026
| Niche | Avg. Commission | CPC (UK/US) | Difficulty |
|---|---|---|---|
| SaaS Software | 20–40% recurring | $5–30 | High |
| Personal Finance | $50–200/lead | $10–50 | Very High |
| Health & Fitness | 5–15% | $3–15 | Medium |
| Electronics | 2–8% (Amazon) | $2–8 | High |
| Online Education | 30–50% | $4–20 | Medium |
| Travel | 3–8% | $3–12 | High |
| Pets | 5–12% | $2–6 | Low |
| Gardening | 5–10% | $1–4 | Low |
| Kitchen/Cooking | 4–10% | $1–5 | Low-Medium |
| Baby & Parenting | 4–8% | $2–6 | Low-Medium |
Ideal Sub-niches for Vietnamese Auto Blogs
For Vietnamese-language auto blogs, consider these niches:
- Shopee/Lazada affiliate: Large Vietnamese market, many products, stable commissions
- Vietnamese software reviews: Accounting, HR, POS systems — low competition, high CPC
- Personal finance: Savings, investing, insurance — high commissions from banks and insurance companies
- Technology: Phone and laptop reviews — high search volume
Niche Selection Mistakes to Avoid
- Choosing too broad a niche: "Technology" is not a niche — "Gaming headset reviews under $50" is a niche
- Following short-term trends: Seasonal niches (NFTs, metaverse...) decline quickly after their peak
- Ignoring your own knowledge: If you don't understand the niche, controlling the quality of AI content will be very difficult
- Focusing only on commission rates: Finance niches offer high commissions but are extremely competitive — not suitable for new websites
See also: Guide to Shopee Affiliate with Auto Blogging.
