#CEXvsDEX101 refers to an introduction or a "basic course" (like "101" in Anglo-Saxon educational jargon) about the differences between CEX (Centralized Exchanges) and DEX (Decentralized Exchanges) in the world of cryptocurrencies.

In summary, it is a fundamental comparison between the two main types of platforms where you can buy, sell, and exchange crypto assets:

CEX (Centralized Exchanges)