To my surprise, I haven't found a question related on this in the search.
There are several possibilities for how one can install packages.
For me the best way for installing additional packages in TeXLive is to use
The manual page for
tlmgr starts with:
tlmgrmanages an existing TeX Live installation, both packages and configuration options.
Installing packages is quite easy,
tlmgr install <packagename>
also removing them again:
tlmgr remove <packagename>
So when can one use
tlmgr, when should one use it?
What are the biggest advantages apart from straightforwardness of using
What are the possible disadvantages?
What are the most useful commands apart from the standard commands?
Note: The question asks not about the pros and cons of updating per se. As indicated after an edit above, there are still multiple ways to update packages, and people (at least me in the past) are using them all mixed together.