My feeling is that Portugal is probably one of the most crypto-friendly countries in the world. And the Portuguese Tax Authority (PTA) does not consider capital gains generated from the sale of cryptocurrencies to be taxable

I think Ethereum is arguably the best altcoin to buy today, largely because of its massive upside potential. It currently is the largest smart contract platform and is also home to the greatest selection of DeFi, dApps, metaverse, and Web3 projects.