Nano

create file
nano some_file.txt

save file
Ctrl + O

exit file
Ctrl + X

cut line
Ctrl + K

undo / paste line
Ctrl + U

search for word
Ctrl + W
or line number
Ctrl + T

Spell-check specific line (needs the spell package)
Ctrl + T

open file at specific line
nano +<line-number> some_file.txt

open file in view-only mode
nano -v some_file.txt