Śākyamuni Buddha’s lifetime preaching can be divided into five periods:

1. The first is called the Flower Garland period, when the Buddha expounded the Flower Garland Sūtra for two or three weeks on the Diamond-seat under the Bodhi Tree for bodhisattvas in the Dharma Body during the eight meetings at seven places. The Flower Garland Sūtra is a provisional Mahayana teaching compared to the Lotus Sūtra, however, it is the distinct teaching (teaching for bodhisattvas) as well as the perfect teaching. The conclusion of this sūtra is in the Brahma-net Sūtra, which expounds the Mahayana precepts for bodhisattvas. …
2. The second of the five periods is the Āgama (or Deer Park) period, when for 12 years Śākyamuni Buddha preached the Hinayana Āgama sūtras in the Deer Park in Bārāpasī and various other places in 16 great states. The Āgama sūtras roughly consists of four groups: Long Āgama Sūtras; Middle Length Āgama Sūtras; Increasing-by-One Āgama Sūtras; and Miscellaneous Āgama Sūtras. These sūtras preach such doctrines as the “four noble truths” (the truth of suffering, the truth regarding the cause of sufferings, the truth regarding the extinction of suffering, and the truth regarding the path to Nirvana) and the “eightfold holy path” (right views, thoughts, speech, acts, living, effort, mindfulness, and meditation), which preach for men of the Two Vehicles (śrāvaka and pratyekabuddha) that all things and phenomena are transient and void. The concluding sūtra is the Sūtra of Legacy Teachings preached just before Śākyamuni Buddha’s death as His final instruction to His disciples. This is known as the Hinayana precepts. …
3. The third of the five periods is the Hōdō period, when Śākyamuni Buddha preached a variety of Mahayana sūtras. This period of preaching is said to have lasted eight years, sixteen years, or an indeterminate amount of years. The sūtras preached in this period include the Revealing the Profound and Secret Sūtra, the Necklace Sūtra, the Entering Laṅkā Sūtra, the Great Sun Buddha Sūtra, the Diamond Peak Sūtra, the Sūtra on the Act of Perfection, the Sūtra of the Buddha of Infinite Life, the Sūtra of Meditation on the Buddha of Infinite Life, and the Amitābha Sūtra. …
4. The fourth of the five periods is the Hannya (Wisdom) period, when Śākyamuni Buddha preached the doctrine of void for 14 or 22 years. The Hannya sūtras include such as the Kōsan hannya, Kongō hannya, Tennōmon hannya, Maka hannya, Daibon hannya, Ninnō hannya, etc. The last mentioned is considered the conclusion of the Hannya sūtras. …
5. The last of the five periods is the Lotus-Nirvana period, when the two sūtras of Lotus and Nirvana were preached. Of the two, the Lotus Sūtra is the principal text while the Nirvana Sūtra is like a gleaning after the harvest in autumn. Established on the basis of the Lotus Sūtra is the Tendai (T’ien-t’ai) School, which is also known by various designations such as the Lotus School, School Established by the Buddha, School Depended-on by Various Other Schools, Secret School, and Exoteric School of Illumination. The Sūtra of Meditation on the Buddha of Universal Sage Bodhisattva, the conclusion of the Lotus Sūtra, provided the spiritual foundation for the establishment of the Mahayana Perfect and Sudden Precept Dais on Mt. Hiei.

Ichidai Goji Keizu, Genealogical Chart of the Buddha’s Lifetime Teachings in Five Periods, Writings of Nichiren Shōnin, Doctrine 3, Pages 238-248

Twice each day I repeat: “The Buddha’s teachings are immeasurable. I vow to know them all.” As I work my way through Nichiren’s writings I can imagine a lifetime of study for myself. Perhaps in the next life I can fulfill this vow.