What is a semantic core
Before starting to solve the question “How to make a semantic core”, it is important to understand what it is. The semantic core of the site is a database of queries (words and phrases) that are introduced into the texts of the site pages for the purpose of its further promotion. The most effective option would be to create separate pages for each main request. These words and phrases (keys) must fully correspond to the topic of the site, as well as have a number of other characteristics (frequency, absence of errors, etc.).
Where to start collecting the semantic core
To begin with, you need to decide how the database of key phrases will be organized. It is most convenient to compile it in the form of a table in Excel or Google documents (more reliable). In other words, it will be a content plan – a list of keywords for the pages of the site, which must be present on it for successful promotion. Here is a visual example of the design: