There are three aspects that we need to keep an eye on and care for at all times. These are :

1.Alignment

Alignment is the term we use in yoga to describe the precise way to do any given pose in order to maximize its benefits and minimize the risk of injury. The ideal, if you will. Have a good lineup allows us to obtain the most benefits from our practice, and allows us to find that point where we can also be comfortable. Misalignment will cause you discomfort in your yoga poses, and worse, can potentially lead to serious injury. At first it may be difficult to accept that your body can’t go where you might want it to, but over time the body builds strength and elasticity needed to extend your reach and progress in asana practice. We must learn to go slowly and to practice each modification or variation of a posture that best fit our level.

2.Focus/Drishti

Drishti is a gazing technique that develops concentration and teaches you to see the world as it really is. Sometimes it is a fixed point on the wall, while others prefer to focus their gaze on the tip of the nose. Having a focus tremendously during practice is to do pratyahara, when you close your eyes and withdraw the senses.This way, there are fewer distractions, and you can take your practice to be more in touch with yourself. Develops our concentration and helps with balance.Sometimes, the focus can also be be directed at ourselves.

3.Breathing

Breathing is the most important aspect of a yoga practice. Breathing is the key to everything after all, without it, we wouldn’t be alive.
In yoga, uneven or erratic breathing is the product of a troubled mind. When you concentrate on each aspect of the breathing process, you are present; you let go of the past and future and are focused on the moment inside the breath. This is why breathing consciously is its own meditation.

If you take care of these three aspects, your practice will develop in a healthy and timely manner.