You do not need a cushion, an app, a teacher, or a quiet room to begin meditating. You need only a few minutes and the willingness to pay attention. Sit in any comfortable position, set a timer for 5 minutes, and place your full attention on the physical sensations of breathing. When your mind wanders — which it will, repeatedly — gently return your attention to the breath without judgment. That's it. That's the whole practice. Everything else — the techniques, the traditions, the philosophy — is elaboration on this simple act of returning. The first session is the hardest. The second is easier. Do it again tomorrow.

Reference:

Wikipedia: Meditation

https://en.wikipedia.org/wiki/Meditation