Hey friends, 1st I want to introduce best Free SEO Tools website 2022. Here you can test your website and check all SEO optimizations.
Title length, URL length and meta descriptions all are important for top ranking. Sub-domain ranking as per own content data method and main domain ranking another way. But if main domain & sub domain are relevant topic then its help each other.
Otherwise main domain & sub domain perform separately. Its depend on many factors like - content, backlink,pagespeed etc.
Don't forget to check your content is unique and not copied. You can check here -> https://free-seo-tools.org/plagiarism-checker
