In Feng Shui the front door is known as the "mouth of the Chi" or threshold for luck and possibilities. The front entrance is where the "Chi" collects and enters. In Feng Shui "Chi" is the universal energy and life force in all things. Feng Shui teaches us how to "tap" into this energy to help our lives run smoother and to bring more happiness and some tools to diffuse negative energy.
Our front door is a reflection of how were are seen in the public eye and neighborhood. When our front entrance is welcoming and open we are inviting positive energy and opportunities. On the flip side if the landscaping is overgrown with obstacles in the pathway it can be viewed as a metaphor for obstacles in our lives. We cannot reach our goals as easily because of the negative Chi created by a stagnant or blocked front door and entrance.
There are many options today for a front door. In Feng Shui it is important your front door is solid, secure and private. I feel it is a personal choice depending on where you reside and your personal style.