Download and extract the tar file from https://www.tug.org/texlive/acquire-netinstall.html
Change directory to the installed location in the teminal and run perl install-tl
Add the installation to path
export TEX_LIVE_PATH=”/usr/local/texlive/2020/bin/x86_64-linux”
export PATH=”$PATH:$TEX_LIVE_PATH”
now create a file hello.tex with the following content
\documentclass{article}
\begin{document}
Hello World!
\end{document}
Run pdflatex hello.tex to obtain the pdf output of the latex doc. It will be created in the name hello.pdf