The Pasuk tells us that on the last day of Moshe Rabenu’s life he went and spoke to the בְּנֵי יִשְרָאֵל. The Pasuk does not tell us where מֹשֶה רַבֵּינוּ went, or why it was important for us to know why he went there.
The תַּרְגוּם יוֹנָתָן explains that before Moshe spoke to the בְּנֵי יִשְרָאֵל, he went to the בֵּית מֶדְרָש to learn Torah, and then he spoke to the people from there. Moshe knew that it was to be his last day, and he wanted to spend as much time as possible learning Torah.

This teaches us the tremendous importance of learning Torah. On his last day alive in this world, Moshe knew that his time would be best spent in the בֵּית מֶדְרָש, studying the Holy Torah. That was the most important thing in his life. Instead of spending time putting his affairs in order, he chose to sit and learn.
Moshe did this also to teach us this amazing lesson. Life without Torah is not considered life at all. The most important thing we can do in this world is to connect with Hashem through the study of the תּוֹרָה הַקְדוֹשָה. The Pasuk in סֵפֶר יְהוֹשֻעַ says, “וְהָגִיתָ בּוֹ יוֹמָם וָלַילָה” “Study it (the Torah) day and night”. Every day and night that we are alive is another chance for us to learn Torah and grow from it. We must take this message from the greatest leader of our people who spent his last precious moments on this world immersed in the study of the Holy Torah.