The counting of the Omer is related to the connection to Zeir Anpin. It has the aspect of male and men should follow this precept. Women are not obligated to count the days of the Omer because as females they have the aspect of Malchut. They receive the light from the connection that men do.
On the first day of Passover we have the full revelation of the light of Zeir Anpin and the night of the Seder, have the aspect of day. This light fills the lower seven sefirot of the vessel in Malchut to sanctify it.
“וּסְפַרְתֶּם לָכֶם, מִמָּחֳרַת הַשַּׁבָּת, מִיּוֹם הֲבִיאֲכֶם, אֶת-עֹמֶר הַתְּנוּפָה: שֶׁבַע שַׁבָּתוֹת, תְּמִימֹת תִּהְיֶינָה.”
“’You shall also count for yourselves from the day after the Sabbath, from the day when you brought in the sheaf of the wave offering; there shall be seven complete sabbaths”
After the first day, we start the counting of seven weeks to reconnect the upper days/sefirot of Zeir Anpin to rebuild each sefira in our vessel.
When Light is revealed, everything is included in the beginning. It’s our work that connects that light into our vessels.
The first day of creation is called ‘Day one’, not ‘first day’. The following days were described as the ‘second day’,’third day’ and so on until the seventh day that was called ‘Shabbat’, which means ‘rest’.
When we reveal light, we expand our vessels with it. Shortly after we feel lack of fulfillment because the vessel grew and need more light to fill up the newly created space.
The sages tell us that “the reward for a Mitzvah is a Mitzvah”, meaning that we are given a new opportunity to make a Mitzvah.
Once we have a space in the vessel that was created by a Mitzvah, we are presented with another opportunity to make a greater Mitzvah fill up the new resized vessel with Light that would again expand the vessel and make new ‘room’ for a new light.
It’s not an easy process and some people would like to feel complete fulfillment and rest, but that is impossible on the righteous path. Avoiding opportunities to do Mitzvah and draw light, shrink our vessels. For these situations, the sages tell us that “a transgression brings another transgression”.
Expanding and strengthening our vessels require work and the best way to maintain easy growth is by doing good and avoiding bad. The daily study even if it is short, helps us staying on the righteous path. It will reward us in this world or the world to come.