Mryntu

I don't know if my explanation is correct, but I'd like to make the following documents

This is about numbering.
I'm trying it myself, but... I think this is too difficult for me.
Can you tell me how to make a document like this?

Thank you!

As long as indenting of section headings is not an issue, the following could be a starting point:

documentclass[a4paper]article
usepackagehyperref

setcountertocdepth5
setcountersecnumdepth5

renewcommandthesectionRomansection.
renewcommandthesubsectionarabicsubsection.
renewcommandthesubsubsection(arabicsubsubsection)
renewcommandtheparagrapharabicparagraph)
renewcommandthesubparagrapharabicsubparagraph)

AtBeginDocument%
 csname @ifpackageloadedendcsnamehyperref%
 % theH... -macros are used ny hyperref's automatic creating of
 % anchor-names/destination-names for hyperlinking. Anchor-names/
 % destination-names must be unique within the document.
 renewcommandtheHsectionthesection%
 renewcommandtheHsubsectiontheHsectionthesubsection%
 renewcommandtheHsubsubsectiontheHsubsectionthesubsubsection%
 renewcommandtheHparagraphtheHsubsubsectiontheparagraph%
 renewcommandtheHsubparagraphtheHparagraphthesubparagraph%
 %
%

begindocument

tableofcontents

sectionFirst Section
subsectionFirst Subsection
subsubsectionFirst Subsubsection
paragraphParagraph (maybe?)
paragraphParagraph
paragraphparagraph
subsectionSecond Subsection
sectionSecond Section

enddocument

Of course, you can use paragraph to make a subsubsubsection, code is as follows:

usepackagetitlesec
setcountersecnumdepth4 % how many sectioning levels to assign numbers to
setcountertocdepth4 % how many sectioning levels to show in ToC
titleformatparagraph
normalfontnormalsizebfseriestheparagraph1em
titlespacing*paragraph
0pt3.25ex plus 1ex minus .2ex1.5ex plus .2ex
newcommandsubsubsubsectionparagraph %define newcommand subsubsubsection

Outcome:

The above reslut achieved can be found in: https://github.com/wanzhenchn/Programming_Assignments_of_Deep_Learning