LaTeX - How to separate titlepage, or not

This short article is the answer for question how to locate abstract on titlepage in Latex. This also could be generalized to issue with keeping titlepage at the separate page, or not.

What is the problem?

The titlepage in Latex document is seperate one by default, what might not be acceptable in some situations. So, we are asking how to control location of the titlepage, what can be limited to issue with abstract location on the titlepage.

How to manage it?

The control of the titlepage location boils down to write proper parameters in \documentclass. There we can decide how the document structure should looks like.

So, if we add to the \documentclass the notitlepage parameter, then the titlepage created by \maketitle command will not be separated from the rest of the document.

Instead, we would want to locate the titlepage on the separate one. In that case we can add titlepage parameter, or add nothing.