Two ways to organize site sections.
Subdomain (blog.site.uz)
- Google treats as a separate site
- SEO weight splits
- Technically easier — can be a separate host
Subfolder (site.uz/blog)
- SEO weight concentrates on one site
- Usually ranks better
- One host and SSL
Recommendation
For SEO, subfolder is usually better. Use a subdomain only if there's a technical reason (separate team or stack).