Tipiṭaka

Traditionally counted as the first discourse — the four noble truths, with the noble eightfold path spelled out inside the fourth.

The Dhammapada's opening chapter — twenty verses in contrasting pairs on intention, on hatred and how it is laid to rest, and on reciting the teaching versus living it.

The four kinds of mindfulness meditation set out in full, and shorter than DN 22 — 235 segments against 454.

The five aggregates examined as not-self; by the end the group of five mendicants are freed of defilements. Traditionally counted as the second discourse.

The longest discourse in the four nikāyas at 1,664 segments — the final journey, the final instructions, the parinibbāna.

Autobiographical — the going forth, the search, the awakening, then the group of five mendicants won over in the deer park at Isipatana. Traditional title: Ariyapariyesanāsutta.

After the quarrel at Kosambī the Buddha leaves town reciting verses on wandering alone, and later tells Anuruddha the eleven corruptions of the mind he gave up himself.

Extended satipaṭṭhāna, with a full exposition of the four noble truths inside the dhammānupassanā section.

Sixteen steps of breath meditation, in four sets of four — and how they fulfil the four kinds of mindfulness meditation.

The classic mettā chant — the conduct asked of one who would reach peace, then love spread over the whole world. Traditional title: Karaṇīyamettasutta.

Don't go by oral transmission, lineage, scripture, logic, or “the ascetic is our teacher” — know for yourself whether a thing leads to harm or to welfare. Traditional title: Kālāmasutta.

The twelve links of dependent origination, each one defined in turn, from ignorance down to old age and death.