What is AFL and it's Sigificance? Where do i get material for reference?

Algos, strategies, code
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AFL is the AmiBroker Formula Language used in Amibroker software to define and create custom indicators, scans, explorations, etc.,

you can check the AFL examples in http://www.amibroker.com/library/list.php

https://www.amibroker.com/guide/a_language.html