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Quick overview of the Pashto alphabet and writing patterns (how the letters are shaped depending on their position in the word). If you don't have any experience with the Arabic script, please watch these videos for Arabic or Persian. They are slower and detailed.
Arabic Writing (Narrated in English)
https://www.youtube.com/playlist?list=PL9E897DB9B208DDC4&feature=view_all
Persian Writing (Narrated in Portuguese)
https://www.youtube.com/playlist?list=PL9C74EF82CD6582F4&feature=view_all
https://www.facebook.com/Hyperglots/
https://www.facebook.com/Hiperglotas/
https://www.facebook.com/PersaSoPraVoce/