"I AM HASHEM YOUR G-D WHO TOOK YOU OUT OF MITZRAYIM, FROM BEING SLAVES."
This is the מִצְוַת עַשֵׂה to believe that ה' exists and that he is the only G-d, who created and controls the world.
This means that we should not worship idols or any other power other than ה'.
This means that we should not use ה''s name when swearing falsely or for no good reason.
This is the מִצְוָה to declare the greatness of שַׁבָּת at its beginning (with קִידוּשׁ) and that it is different than all other days, at it's end (with הַבְדָלָה).
This מִצְוָה is to honor one's parents by making sure that they have food, drink and clothing. When they leave, you should escort them, and when they come you should welcome them.