Numerology is a belief in the mystical relationship between numbers and events or personalities. It is often used for divination or to gain insights into a person's character, destiny, or future events. Here are some key concepts and methods used in numerology:

### Key Concepts:

1. **Life Path Number**:
- This number is derived from your birth date and is considered the most important number in numerology. It gives insights into your life purpose and the challenges and opportunities you may face.
- **Calculation**: Sum the digits of your birth date (day, month, and year) until you get a single digit or a master number (11, 22, or 33).

2. **Expression/Destiny Number**:
- Derived from the full name at birth. It reflects your talents, abilities, and shortcomings.
- **Calculation**: Assign numerical values to each letter in your full name (using a numerology chart), sum them, and reduce to a single digit or master number.

3. **Soul Urge/Heart’s Desire Number**:
- Reflects your inner self, desires, and motivations.
- **Calculation**: Sum the numerical values of the vowels in your full birth name, then reduce to a single digit or master number.

4. **Personality Number**:
- Represents the outward persona you project to others.
- **Calculation**: Sum the numerical values of the consonants in your full birth name, then reduce to a single digit or master number.

5. **Birthday Number**:
- Derived directly from the day of the month on which you were born. It indicates certain skills and talents.

### Numerical Values for Letters:

| Letter | Value |
|--------|-------|
| A, J, S| 1 |
| B, K, T| 2 |
| C, L, U| 3 |
| D, M, V| 4 |
| E, N, W| 5 |
| F, O, X| 6 |
| G, P, Y| 7 |
| H, Q, Z| 8 |
| I, R | 9 |

### Example Calculations:

#### Life Path Number:
For someone born on July 14, 1990:
1. Birthdate: 07/14/1990
2. Sum the digits: 0+7 + 1+4 + 1+9+9+0 = 31
3. Reduce to a single digit: 3+1 = 4
4. Life Path Number: