What are the three different techniques of Gematria; from the Literal Qabalah and how do they function?

Gematria / ɡəˈmeɪtriə / (Hebrew: גמטריא or גימטריה, plural גמטראות or גמטריאות, gematriot) [1] is an alphanumeric code of assigning a numerical value to a name, word or phrase based on its letters. People who practice gematria believe that words with identical numerical values may bear some relation to each other or to the number itself. A single word can yield multiple values depending on the cipher used.

Gematria originated as an Assyro-Babylonian-Greek system of alphanumeric code or cipher that was later adopted into Jewish culture. Similar systems have been used in other languages and cultures: earlier, the Greek isopsephy, and later, derived from or inspired by Hebrew gematria, Arabic abjad numerals, and English gematria.

A well-known example of Hebrew gematria is the word chai ("alive"), which is composed of two letters that (using the assignments in the Mispar gadol table shown below) add up to 18. This has made 18 a "lucky number" among the Jewish people. Gifts of money in multiples of 18 are very popular.[2]