AMPscript

AMPscript official documentation - SFMC documentation.

AMPscript in StackExchange - AMPscript tagged questions.

SF Developers Portal - All development related topics.

AMPscript Getting Started - general overview (GitHub).

AMPscript Uncovered - Video

Advanced AMPscript - Video

AMPscript LookUp Examples - Spriggs Blog

Useful AMPscript examples