In order to practice mindfulness meditation and start being more mindful in general, it's helpful to have a basic understanding of what mindfulness is. Please watch the following videos that describe what mindfulness is and some of its benefits.
Professor Thinking and Professor Holding Magnifying Glass
Cartoons by Videoplasty.com, CC-BY-SA 4.0
Man on Phone by Vectortoons, CC BY-SA 4.0