How to collect keywords under a set of categories?

Question

Search Engine Optimization

Hello. There are several specific categories, such as Auto, Movies, Music, Books, Animals, Family, and so on. Under each category, you need to collect as many keywords and phrases as possible (2-3 words maximum), so that later they can be used to determine the subject of the text. How can I do that? Maybe there are ready-made bases? I would be very grateful for a hint

Answer 1

Yandex Wordstat

Answer 2

I forgot to clarify that the task is to determine the subject of the text, and not to set up an advertising campaign. therefore, keys such as "buy Ryazan boots" are not suitable. We need words and phrases. For example, the words "bmw", "limousine", "audi" will go under the category Auto. Etc