If you are just starting out with Pd and want to just try it out, then check out the Start Here page. If you are ready to start learning Pd from the beginning, here are some resources:
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Digital audio with Pure Data (audio digital con pure data) - an online massive open course (MOOC) in Coursera, that offers an introduction to digital audio with Pure Data. This course was produced in spanish by the Universidad Nacional Autónoma de México.
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FLOSS Manuals Pure Data - an online book for learning media programming with Pd from the beginning, it covers audio, video, music, sensors, and more.
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Cheetomoskeeto's Pure Data Lectures - video screencast lectures that start you from the beginning for making music and sound, as well as a little video.
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Theory and Techniques of Electronic Music - understanding the math and programming behind digital signal processing used in electronic music.
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Didactical material by Alexandre Torres Porres :
And more here : https://puredata.info/docs/tutorials
And here : https://puredata.info/docs/BooksAboutPd