I post very short videos to explain LaTex in details one topic at a time. In LaTeX Mathematical expressions contain two writing modes. The inline mode and the display mode.
These are basically placed on the centre of the page and the equations are important ones that deserve to be.
However the latter kind of work often involves writing Math equations in digital form. For producing an inline expression the math expression should be written between the dollar sign. This what wikipedia said about Latex. There are three ways to write a math equation in LaTeX and they are described as follows.