Here Ajahn Chah, one of the most influential teachers of the last Century, gives beautiful, simple instructions for mindfulness of the breath, the foundational practice for all meditation. We can see that it is normal for the mind to wander and how we should accept this gently. This simple exercise can be done formally today, or informally between meetings, waiting in a queue, while taking a break:

Keep your attention on the breath. Perhaps other thoughts will enter the mind. It will take up other themes and distract you. Don’t be concerned. Just take up the breathing again as the object of attention

Ajahn Chah, Bodhinyana