Here are a series of nineteen articles written in 2015 by Michael Erlewine, all focused on Tibetan Buddhist mind-training methods, and geared for the beginning and intermediate practitioner. They are easy to read and understand and are based on hands-on practical experience rather than abstract theory.
Mind Training: Selected Articles, Michael Erlewine, Heart Center Publications, Paperback, 100 pp, $5.50

Michael Erlewine has studied Buddhism since the 1950s, and practiced it for last forty years, running the Heart Center for meditation instruction since the 1980s. Trained in the Karma Kagyu system of Tibetan Buddhism, Erlewine has worked practiced Mahmudra Meditation for 27 years under the guidance of Karma Kagyu teachers.