First, you have to start somewhere.

Second, you will learn about the Ethereum Virtual Machine, a.k.a. the EVM, which is on its way to becoming the smart-contract platform underpinning different protocols. In other words, it will be important in the field, in the same way that the JVM is in the Java-Scala-Kotlin-Clojure-etc. world.

Third, Ethereum, in general, is the most advanced smart-contract platform and support community around, which allows you to experiment in ways that upcoming and future protocols cannot yet offer.
When these other smart-contract protocols come of age, your knowledge of Ethereum will be readily applicable and transferable. In other words, you will be ready and / or ahead of your peers.

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