How to make a new line?

I know the issue I met is too simple, but I just coundn’t find any template which tell me how to make a new line in single block. I can only paste the different paragraph to different blocks, but it’s not convenient.
Here is my code in single block:
\section{Dispersion curve equation} Lamb wave is a kind of elastic guide wave, its properties and dispersion curve equation can be found in any solid acoustic book. I'll introduce the equation briefly. \\ \newline \linebreak \vglue \vspace*{*} % These are what I tried to make a new line. The dispersion curve equation can be wrote as: \begin{equation}\label{eq 1} \frac{\tan ({k_t}b/2)}{\tan ({k_l}b/2)} =  {\left[ {\frac{4{k^2}{k_l}{k_s}}{(k_s^2  {k^2})^2}} \right]^{ \pm 1}} \end{equation} $+$ and $$ correspond to symmetry mode and antisymmetry mode, respectively.
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