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Free public beta until December 4, 2026: every course is open, no card needed. After that, the first chapter of each course stays free and full access is a one-time $39 ($19 for up to 100 founding members chosen for helpful feedback). Your progress is kept. How the beta works

byte

Eight bits.

A byte is a group of eight bits, holding values 0 to 255 when unsigned. It is the smallest unit most memory addresses point to.

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