Find in files is also known as find all and as multi-file search: it searches across multiple files.
First, open vim at the current directory (or at a specific file).
C:\temp> vim .
vimgrep to find the word "foobar" within all files.
:vimgrep /foobar/ **/*
That vim command will do the following:
- find all the files that contain the word "foobar"
- add those files to the quickfix list
- jump to the first instance of the word "foobar"
Third, open the quickfix list to view the files.
Fourth, within the quickfix list, use the j k keys to select a file, then press enter to open it.
Finally, close the quickfix list.
That's enough to get started.