Splitting the site structure into subdomains?

Question

Search Engine Optimization

Hello. The point is the following. A website is under development that offers the service. In addition to the main service, there will be an online store with related products and a blog for search traffic.
An illustrative example.
Personal training is the main service. The store sells sports nutrition and equipment. The blog contains feature articles.
If you divide the site structure into the main page with the main domain, and into 2 subdomains, a store and a blog, will there be any problems with promotion?

Answer 1

First collect/order semantics, cluster and build a structure based on it. Then you will have a clear picture and with the right structure there will be no problems with promotion.