The First House describes your outward behavior. It involves your disposition, appearance, manners, and sense of self. The first house indicates your outlook on life and helps you to project your unique talents into the world. It is governed by Aries.
The positive use of the first house is that it helps you to put your best foot forward into the world. The negative interpretation is that you can get caught up in excessive ego issues or the need to show off due to self-esteem or self-worth challenges.
Your physical appearance may correlate with the zodiac sign on their first house cusp. A Libra Ascendant may be graceful while a Capricorn Ascendant may appear conservative and stern.
The first house often indicates activities that you take into the world. An Aries first house may be athletic and prefer to wear bright, fiery clothing. A Pisces first house may appear dreamy and illusive, preferring gentle colors like the blue of the ocean.
When you have natal planets in your first house, the planet flavors the way you project energy into the world. If you had Mars in the first house, for example, you passionately and courageously pioneer new paths in the world. However, you may need to work through anger issues or the tendency to not complete projects.