These h1-h4 headings represent the logical heading structure which means there is nothing wrong, You can have a main heading and it can immediately follow it with subheading to categorize your sections in the body.
However in order to be logical the subheading should be niche of the main heading rather than talking about a completely different topic.
контент от Н2 до следующего Н2, будет в секции отдельной. Чаще всего это хорошо и правильно. _ Если в Нгруп засунете, то по сути сделаете Н2 обычным текстом для поисковика.