9.4.3 Can you answer these questions?

9.4.3.1 Vertically align symbols in the table

https://tex.stackexchange.com/landing/r/digest?cta=question&id=671846

I want to create a table that is aligned vertically and horizontally. 
I use the following script 
How can I vertically align the symbols in the table? 
Currently, they are automatically aligned towards ... 
[tables] [vertical-alignment] [latex3]
 

asked by Damiano https://tex.stackexchange.com/landing/r/digest?cta=user&id=256704 Score of 1

answered by egreg https://tex.stackexchange.com/landing/r/digest?cta=user&id=4427 Score of 0

9.4.3.2 Make custom text refer to item in bibliography

https://tex.stackexchange.com/landing/r/digest?cta=question&id=671774

I'm trying to make some custom text refer to an item in the bibliography. There's an answer here, but it doesn't work for me so far. The problem is that somehow it keeps sending me to the top of the ... 
[bibliographies] [hyperref] [hyperlink]
 

asked by Rutger https://tex.stackexchange.com/landing/r/digest?cta=user&id=288395 Score of 1

9.4.3.3 How to display a list of all user made newcommands and what they do?

https://tex.stackexchange.com/landing/r/digest?cta=question&id=671951

I am writing my bachelor thesis and I am introducing more and more newcommands, but I tend to forget them. Is there a way to display all user created new commands, like a make a list or a table? 
I ... 
[renewcommand]
 

asked by Francesco https://tex.stackexchange.com/landing/r/digest?cta=user&id=288494 Score of 1