Buddha’s essential discourses

Buddha's first dicourse

Dhammacakkapavattanasutta (setting the motion of the wheel of Dhamma)

Buddha's second discourse

Anattalakhanasutta (Discourses on No-Self)

Buddha's Last discourse (some part)

Buddha's Methodology of Meditation

Mahasatipatthana - sutta

Manual for the Breath Meditation

Mindfulness of Breath