How do you use autocomplete and the file explorer in VIM?

In Insert mode Ctrl+n autocompletes the word you're typing; :Vexplore opens a file-browser sidebar.

Ctrl+n ("next") scans the current buffer (and open files) for words that start with what you've typed and offers them — handy for repeating long variable or function names without retyping. :Vexplore opens netrw, vim's built-in file browser, in a vertical split so you can navigate directories and open files with Enter.

Autocomplete and file explorer:

Autocomplete example: In Insert mode, type partial text and press Ctrl+n to see suggestions:

echo function1
function1
for
echo
recu function2
     recursive
     sh
-- Keyword completion (^N^P) match 3 of 6

File explorer (:Vexplore): Opens a vertical split showing the directory tree:

unbound/
vmware-tools/
vulkan/
...
yum.repos.d/

Navigate and press Enter to open files.