Macros are lists of commands. Any series of operations that has to be performed frequently is a good candidate for being a macro.
Macros can be written manually: they are just ASCII files, each command
occupying a line (lines starting with ‘#’ are considered comments;
lines starting with other nonalphabetical characters are presently
ignored). But the real power of macros is that they be recorded during
the normal usage of ne. When the recording terminates, the
operations that have been recorded can be saved for later use. Note that
each document has its own current macro (the last macro that has been opened
or recorded).