@webhostpune1 said in titles length, URL length and meta descriptions on a subdomain effecting SEO on main domain?:
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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
Dm it's upto to the point.
Good job.