The User Guide & Wiki
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Overview:
There are lots of ways to learn more about TouchDesigner, but by far one of the most powerful resources to deepen your knowledge is the TouchDesigner User Guide and the TouchDesigner Wiki. Here you’ll find help pages for every operator, the Python Application Interface for every OP class, along with articles about optimization, configuration, and troubleshooting.
Also you can get popup help for any parameter by holding down Alt and rolling the cursor over any parameter, which fetches it from the wiki.
Finally when you start TouchDesigner, if you click “TouchTips” on the splash screen, you get random usage tips.