The book I often recommend to people keen to learn more about mindfulness and meditation is Mindfulness in Plain English by Ven. Henepola Gunaratana. I suggest you buy a hard copy to read (and re-read!) but it’s also generously available for free online: http://www.urbandharma.org/udharma4/mpe.html
It is an excellent introduction, that is accessible without dulling down the profound potential of the practice. Enjoy!
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