This is the second book of the Mishneh Torah of the Rambam, Rabbi Moshe ben Maimon. Laws of the Sefer Torah, Tefillin, and Mezuzah.
This chapter explains the difference between head and arm tefillin writing, the rules regarding open and closed sections, complete words and omissions, the crowns of each letter and how many letters they have, and whether to buy tefillin from an unskilled person, or whether to write tefillin for oneself or buy them from a skilled practitioner.

https://www.youtube.com/watch?v=dJEmLpc4Q2s

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