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Is there a website to learn Latex commands to start a project from scratch ?

Thank you for a prompt response.

Per your instruction, I remarked
\renewcommand*{\numberline}[1]{\hb@xt@3em{#1\hfil}}
and inserted
\renewcommand*{\cftsubsecnumwidth}{4em}

After recompiling, the Chapter and Section Level got overlapped
however the Subsection indented correctly in TOC.
I ...

Pardon me, I am new to this blog.
I got a lot of help with Latex community related to my project, for
which I am grateful.

I looked around various websites related to my question i.e. how
do I increase the indentation for subsection? Am I missing something in my code?

Note : The entire ...