This type of meditation has you focus on a single point like a spot on the wall in Zazen, a candle flame, a mantra, or the feeling and actions of your body as you breathe in and out.
Concentration Meditation is a good source when trying to learn harder meditations. When you notice that your mind wanders onto other things you just bring it back to the item that you chose to focus on.
This type of meditation will help you keep more focus in your life, be aware of your surrounding and react to them easier, and generally improve your mental health.
This meditation may turn into a Transcendental Meditation.
One thing that you may notice when concentrating (focusing) your sight on one thing is that your vision will start to darken around the edges. Once you realize this it may startle you and your full vision will come back. This just means that you have achieved a level of deeper meditation so don’t be afraid to explore. It takes great practice to be able to achieve a result like this.
Other things that can happen while in deep concentration meditation is that objects in front of you will become transparent and you will be able to see the objects that were previously hiding behind them. You may even see a mist appear on the floor and/or be transported to another place or time.