Something I use often in command mode.
close current file. closes vim is last file.
move to last stored position in edited file
list all symbols found in tags
go to first symbol found in tags. :tnext/:tprev/:tlast to browse all matching tags
find next occurence of symbol under cursor
find previous occurence of symbol under cursor
find matching opening/closing bracket
"go file" - open file with name of word under cursor
delete characted under cursor. Unlike <Delete> works on all terminals.
delete current line
go to the end of file
go to the beginning of file
Command mode with its simple shortcuts was saving my ass on numerous occasions. Broken terminals are still around. Even if another day all borken terminals get fixed, tools like busybox working over raw serial line will be with us for quite some time ;-)