Is it a correct way if I write a H1 without any text under and then immediately after I write the H2?
The H2 will be instead followed by the text of my page. To be clearest as possible the structure could be this:
<h1>Camping in Australia: a great choice in the untainted nature!<h1/> <h2>Campgrounds for tents for your camping in Australia</h2> <p>some paragraph</p>
As you can see, the h1 title has not text, and it's immediately followed by the h2 title wich will, instead, contain important informations in the text for the user.