Hermeticism is the spiritual and philosophical tradition built on writings credited to Hermes Trismegistus, the legendary sage who joined the Greek god Hermes with the Egyptian god Thoth. Its core texts were written in Roman Egypt and rediscovered in the Renaissance.
These guides cover the tradition from its sources: the Corpus Hermeticum, the Emerald Tablet, and the modern Kybalion with its seven Hermetic principles.
Start with what Hermeticism is. Then read the 7 Hermetic principles.