Which editor you choose is up to you, however, we recommend the use of
the vi editor (or its cousin vim or its more
graphical cousin gvim) - a general purpose editor used by
a large proportion of the Unix community.
However (as is the case with most Unix-based editors), you will need to learn a number of keyboard-based commands to interact with the editor. Again, mastery takes time and practice - don't be afraid to try things!
Some vi tutorials you may find useful include: