Common methods use your date of birth or name reduced to a single digit using numerology rules (e.g., Pythagorean method).
No. Numerology is a belief system and not supported by scientific evidence; treat it as guidance or entertainment.
Some systems include cycles or personal year numbers that change annually, while core numbers from birth remain constant.
You may use it for personal rituals or choices, but avoid making major financial or legal decisions based solely on numerology.