/ Although according to the Halacha, it is not necessary to check one's Tefillin and Mezuzos more than twice in seven years, those who are G-d fearing try to get their Tefillin and Mezuzos checked every Elul. [Of course, this is the busiest time for Sofrim, so one should not delay and arrange with a sofer a time when to bring them in]. However, one should not limit this to Tefillin and Mezuzah inspection. One should likewise do an internal examination of one's spiritual state, and any breach one may have in his mitzvah performance and Torah learning one should endeavor to correct.
During the month of Elul one should use the greeting of Kesivah Vechasimah Tova when writing to a friend, ending a conversation with a friend and so on.
During the month of Elul one should increase in one's performance of Teshuvah, Tefilah and Tzedokah. This is alluded to in three verses in the Torah which contain four consecutive words whose first letters spell Elul.