Existing official & 3rd party tutorials

[fxshrat]

Places to look first for existing tutorials:
AmiBroker Tutorials section
AmiBroker Newsletters (replaced by Knowledge Base - see below)
AmiBroker Knowledge Base
AmiBroker Users Knowledge Base
AmiBroker Basics Section


AFL Basics:
AmiBroker Formula Language (AFL)
Understanding how AFL works
Understanding QuickAFL
AFL coding mistakes
AFL (and C)
Matrix basics

Advanced AFL Basics:
Do not make assumptions on number of bars
Using loop within TimeFrame functions
AmiBroker custom backtester (Houston PDF)
AmiBroker custom backtester (UKB) (credit to user Wayne aka GreatPig from AussieStockForums)
Looping in AFL (PDF) (credit to user Wayne aka GreatPig from AussieStockForums original thread)
Introduction to ATC (PDF) (credit to user Herman van den Bergen)

Debugging
How to use built-in debugger (AmiBroker 6.1 upwards)
www.amibroker.com/guide/h_debugger.html

Using _TRACE/_TRACEF:
www.amibroker.com/guide/w_log.html
www.amibroker.org/userkb/ (topic "8.1. Debugging AFL")
technet.microsoft.com/en-us/sysinternals/debugview.aspx

Using printf:
www.amibroker.com/guide/h_interpret.html

Using Explorer
www.amibroker.com/kb/2014/09/29/debugging-techniques-part-1-exploration/

Functions to use
www.amibroker.com/guide/afl/_trace.html
www.amibroker.com/guide/afl/_tracef.html
www.amibroker.com/guide/afl/printf.html


Three important basics

Multi-threading:
www.amibroker.com/guide/h_multithreading.html

Performance:
www.amibroker.com/guide/x_performance.html

Floating point arithmetic:
www.amibroker.com/kb/2010/07/20/about-floating-point-arithmetic/

Feel free to add more official or 3rd party ones...

[teyano]

Some basics:

www.youtube.com/user/DaveASXWatch/videos

[fxshrat]

Backtest Currencies( incl. dynamic currency conversion)

[larryp]

Technical Analysis of Stocks and Commodities magazine. Each month for the past 12-15 years there is one article with either an indicator or trading system idea that is then coded into afl by TJ in the Traders Tips section.

Read the article and then dissect TJ's code, a nice way to practice implementation of afl.