Read this and the papers mentioned inside it to get an overview of the market:
https://messari.io/pdf/messari-report-crypto-theses-for-2021...
It might be worth it to get a pro subscription at messari.io or theblockcrypto.com for a saner alternative to crypto twitter and other news outlets.
The quickest way to learn is to actually use it. Make trades on uniswap, earn fees with a liquidity pool, get some sushis, stake them, etc. etc. Unfortunately these days eth gas fees are very expensive though and you will spend a lot of money in fees.
It's nice to read about the history how everything involved and get to know some of the characters behind. Two books i enjoyed: - Bitcoin Billionaires - from the guy who wrote that book from the facebook movie - Out of Ether, how Ethereum got started