M-. (i.e. the Alt dot key combination in Emacs) does xref-find-definitions which only works if you have set up something called a tags table which is incomprehensible and a hassle and therefore unacceptable. It is much easier to use describe-function or describe-symbol, which open up *Help* pages in Emacs.
Emacs Dired: View (and edit) file contents without opening a file
Some files open fast, others slower. It may depend on the file viewer too. But in Emacs Dired it is possible to extract file contents without opening the file. The inbuilt function for it is insert-file-contents.
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