7.66.3 Can you answer these questions?

7.66.3.1 How to define a section(subsection) with custom background colorpage?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=619752

Is it possible to redefine certain \section or \subsection to have custom pagecolor? 
There are certain solutions like: 
How to change the background color only for the current page?, 
underline and ... 
[macros] [sectioning] [tcolorbox] [backgrounds]
 

asked by Boogeyman https://tex.stackexchange.com/landing/r/digest?cta=user&id=124159 1 vote

7.66.3.2 Does texdoc support online automatic downloading of documents?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=619866

If I didn't install the documentation when I installed TeX Live. Is there any way for texdoc to automatically download the documents I need? For example, when I run texdoc XXXX, texdoc automatically ... 
[texlive] [texdoc]
 

asked by Clara https://tex.stackexchange.com/landing/r/digest?cta=user&id=238422 1 vote

7.66.3.3 How to make the citation of references as numbers in the text ? and with square brackets?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=619585

in references.bib 
@ARTICLE{2, 
AUTHOR={A. Gama  and Lazarevic Aleksandar and Latecki Longin Jan}, 
TITLE={Machine Learning techniques}, 
PUBLISHER={IEEE}, 
ADDRESS={}, 
YEAR={2007} 
} 
@BOOK{3, 
... 
[overleaf]
 

asked by user4556432 https://tex.stackexchange.com/landing/r/digest?cta=user&id=254973 1 vote