How to add space before and after paragraph?

Question

I have text in this structure (simplified):

\paragraph{\textbf{\uv{Main question is.... ?}}}

Main question is divided into three subquestions....    

\paragraph{Sub question 1.} Sub question 1.....
\paragraph{Sub question 2.} Sub question 2.....
\paragraph{Sub question 3.} Sub question 3.....

but paragraph "Main question is divided into three..." is placed immediately after previous paragraph but I would like to place some space before and after this paragraph. For some reason (for me unknown) tag \vspace doesn't work.

How can I create space between these paragraphs?

Answer 1

You can use \bigskip with a blank line before like this:

\paragraph{\textbf{\uv{Main question is.... ?}}}

\bigskip
Main question is divided into three subquestions....    

Answer 2

Your question wasn't so clear as the fragments were too small to show the desired layout, in particular \paragraph{..} is an inline heading for the following paragraph text but you did not show any following text. The following document uses \paragraph and \subparagraph with non zero \parskip which is possibly closer to what you want, although the exact spacing could be tuned.

\documentclass{article}

\usepackage{parskip}

\begin{document}

\paragraph{Main question} Main question ..

Main question is divided into three subquestions....    

\subparagraph{Sub question1} Sub question 1.....
\subparagraph{Sub question} Sub question 2.....
\subparagraph{Sub question} Sub question 3.....

\end{document}