Semantic core of the site is a set of such keys, by which your resource can be found in search engines. In many ways, it is the semantic core and the correctness of each query and predetermine the effectiveness of work on optimisation and SEO-promotion.
Development of semantic kernel with the help of specialists leads to the need to talk about the budget for the project, as well as the expected results. Someone wants to immediately take a leading position in the niche, others like a gradual climb to the top.
Types of queries by their demand:
High-frequency (HF) - these are competitive words, the value of which is ten times higher than the others. They provide maximum audience coverage. That is, in the percentage ratio: visits / purchases - the site will not have a very high performance.
Medium-frequency (MF) - such requests are fulfilled many times less than for HF. Specialists manage to manoeuvre between wide coverage and quality of traffic. If we compare MF with HF, it should be noted that users entering queries of medium frequency, already know something about the product/service and want specificity.
Low-frequency (LF) - these are queries that are rarely required by users in the exact execution. They consist of 3-5 keywords, bring quality traffic, but in much smaller volumes.
A set of queries of the semantic kernel are made separately for each promoted page of the site. Queries should not be repeated - for each page should be a unique set of phrases and words. Therefore, it is necessary to initially determine the pages that most closely match a particular search query. For any commercial project in the network is paramount to attract to the pages of the site as much as possible target audience.
Why is keyword research so important?
Before semantic search, keywords were the primary means of communicating to search engines the topics you were discussing. Typically, the more often you used a keyword, the more relevant your content looked. Unfortunately, this led to techniques such as keyword stuffing that were designed to trick the search engine and ultimately damage the user experience.
Over the past few years, Google has introduced various updates that have been designed to better understand the concepts of query and website. This has led to a change in the importance of keyword usage.
This does not mean that keywords are obsolete. They are still used by search engines to identify the topics involved, but are seen as part of a bigger picture. Instead of extracting keywords, search engines look at how different topics are related to better understand the content your material covers and how it relates to different queries. In this way, they can return more relevant and applicable search results for users, improving user interaction.

Low competition and high competition keywords
How to find low competition keywords
To find the right number of keywords with low competition and high search frequency, you need to follow these three steps:
Gather a list of topics
Think about what your target audience would search for on Google and write down all the useful information. You don't necessarily need to dig out exact phrases to start with, it will be enough to summarise the topics.
For example, if you are in the business of selling computer equipment, these could be:
Just write down what comes to mind. When you collect 5-10 ideas, move on to step two.
Expand your list of ideas with the keyword analysis tool
Paste the ideas into the keyword analysis tool you normally use. You'll see keyword options that include one or more of the words and phrases you entered, as well as monthly search frequency and other SEO metrics.
Filter out keywords with low "complexity"
Many keyword analysis tools provide a complexity score. This is a numerical representation of how difficult it would be to rank in the top 10 of Google for a particular search query.
In the Phrase Match report, filter keywords with a KD score between 0 and 10 to find keywords with low competition.
Should I avoid keywords with high competition?
Many people focus on low competition keywords because they think they won't be able to rank for other words. Even if this is true in the short term, high competition keywords can be a good opportunity for a variety of reasons.
Highly competitive keywords are often great topics that simply attract links - they are content that is honed to attract links.
To find these topics, you need to do the opposite of what you did before. Instead of filtering out keywords with low KD scores, focus on keywords with high KD scores.
Targeting highly competitive keywords has two advantages (even if you're not ranking).
You can increase your site's authority. Brand authority doesn't grow from nothing. It is primarily a byproduct of links.
You can transfer this "authority" to important pages. Use internal links from authority "bait" to promote relevant pages targeting less competitive keywords.
This second benefit - you could call it the middleman technique.
It's a handy way to boost the "authority" of boring pages that are difficult to get links to.
Keyword competition is relative
Since the keyword difficulty score doesn't take into account all aspects that affect competitiveness, you should always manually check the pages ranking at the top before creating content.
Otherwise, you may choose keywords that aren't really low-competitive. While there's nothing wrong with this, such keywords should be medium or long-term targets, not short-term.