To change the default font size of a LaTeX symbol or a text add the below package in your document
\usepackage{lmodern}
Use the below command to change the font size of a symbol or a text and also its type
\fontsize{size}{baselineskip}\selectfont
The command font size has three arguments
First is size
The second is baseline skip and
The third is to select a font
Change the font size of a symbol or a text
Predefined command to change the size
Here are some predefined commands that you can use without adding any package
Tiny
{\tiny Tiny}
{\tiny Tiny}
Script
{\scriptsize Script}
{\scriptsize Script}
Foot
{\footnotesize Foot}
{\footnotesize Foot}
Small
{\small Small}
{\small Small}
Normal
{\normalsize Normal}
{\normalsize Normal}
large
{\large large}
{\large large}
Large
{\Large Large}
{\Large Large}
huge
{\huge huge}
{\huge huge}
Huge
{\Huge Huge}
{\Huge Huge}
Change the font type of a text and its size
{\fontsize{50}{10.5} $ {\rm Roman} $}
{\fontsize{50}{10.5} $ {\em Enfático} $}
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