Vim treats filenames in our document as a kind of hyperlink. When configured properly, we can use the gf command to go to the filename under the cursor.
go to file
suffixesaddoption allows us to specify one or more file extensions, which Vim will attempt to use when looking up a filename with thegfcommand.
Specify the Directories to Look Inside We can configure 'path' option to reference a comma-separated list of directories. When we use gf command, Vim checks each of the directories listed in 'path' to see if it contains a filename that matches the text under the cursor.
.stands for the directory of the current file. empty string(delimited by two adjacent commas) stands for the working directory.