As you study Buddhism you may run into mention of the 31 Realms. Here is a handy-dandy beginner's guide to them.
The Mahayana doctrine of Trikaya -- the three bodies of Buddha -- teaches us about the nature of enlightenment, the nature of existence, and the way a Buddha manifests in the world.
The Buddha's first sermon is sometimes called the "first turning of the dharma wheel." In this sermon the Buddha presented the Four Noble Truths.
Vassa, a three-month Buddhist monastic retreat held during the monsoon rains, is a tradition that began with the historical Buddha.
Many Mahayana Buddhists practice veneration to Bhaiṣajyaguru, the Medicine Buddha, on behalf of the sick.
The pure lands of Mahayana Buddhism are understood in many ways.
Saga Dawa is the "month of merits" for Tibetan Buddhists. During this fourth lunar month Tibetans make a special effort to keep precepts and make merit through generosity and devotion.
Wonhyo was a major patriarch of Korean Buddhism and one of the most influential scholars of eastern Asia.
The Arya-Bodhisattva-gocara-upayaisaya-vikurvana-nirdesa-nama-mahayana-sutra (yes, that's its name) is a Mahayana Buddhist sutra that presents a Buddhist theory of war.
Palden Lhamo is an iconic figure from Tibetan Buddhism. She is a wrathful protector of Tibet and Buddhism and the subject of a particularly gruesome story.