The foundational books about centering prayer and contemplation by Fr Thomas Keating:
Centering prayer app: https://www.contemplativeoutreach.org/centering-prayer-mobile-app/
Spiritual journey series of videos by Fr. Keating, free on Contemplative Outreach YouTube channel.
Contemplative Outreach teaches other practices to support living the contemplative dimension of the Gospel in daily life.
Lectio Divina: https://tinyurl.com/3eahayt4
Welcoming Prayer: https://tinyurl.com/4td7z234
For further information: https://www.contemplativeoutreach.org/