Unlike rituals or devotion to a personal god (which are seen as preliminary), the direct method is to turn attention inward and ask: “Who am I?” By tracing the source of the ‘I’-thought, one abides in pure consciousness.

: The central practice of distinguishing between the "Real" (the eternal, unchanging Brahman) and the "Unreal" (the temporary, changing universe).

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For the most helpful and authoritative content, these versions are widely recommended: Swami Madhavananda (Advaita Ashrama)

If you download a free PDF, you are almost certainly getting Madhavananda. It is a masterpiece of scholarship but requires patience.