I am sometimes asked for resources or tools for studying Pali, the language of the Theravadin canon, encapsulating more or less the very language of the historical Buddha. My own instruction in Pali has been on my own with a good friend using Gair and Karunatillake (see below).
I then went on to study with Prof. Richard Gombrich in Oxford in 2011; which I thought I wrote about at some point, but I see only a couple other posts on the topic, one about the early launch of his online Pali classes, and one on his lecture on Religious Experience in Early Buddhism (both of which I strongly recommend).
Beyond that, the following have been wonderfully and kindly offered by reddit user xugan97
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Ajahn Brahmali’s Introduction to Pali along with Warder’s Introduction to Pali on which it is based
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Answer keys to this book – John Kelly (interlinear), Ajahn Brahmali (annotated), and flash cards
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Buddhanet and http://pali.pratyeka.org/ – links to Narada Thera, Duroiselle and De Silva’s Pali books
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Bhikkhu Bodhi’s lectures on Pali Primer by De Silva
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Bhikkhu Bodhi’s lectures on A New Course in Reading Pali by Gair and Karunatillake
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A New Course in Reading Pali by Gair and Karunatillake – with translations of all the readings in the book
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Pali Buddhist Texts: An Introductory Reader and Grammar by Rune Johansson
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https://learning.pariyatti.org/ – a couple of different free courses
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Practical Guide to Pāḷi Grammar by Anandajoti Bhikkhu – a 30 page compact reference
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An easy introduction to Pali – excellent explanations and layout – anonymous author
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An Introductory Grammar of the Pali language by Allan Bomhard
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For reading, suttacentral.net has side-by-side translations (with pop-up dictionary) of majority of the suttas
Just a fraction of this could easily get you going on your first couple years of studies. Dive in and enjoy (best if done with a good friend).