Rel canonical
rel canonical — is a tag that tells search engines which of the same pages are considered additional pages and which are considered main pages.
wiki
LTV or customer lifetime value
LTV is a metric that can be used to understand the degree of customer interest in a particular product/service.
What Wordstat Yandex is and what it is for
What is Yandex.Wordstat and what is it for, read in this publication
Target Audience
A target audience is a group of consumers who exhibit the most active consumer behaviour in a particular community.