$ETH Ethereum (ETH) is a popular cryptocurrency used for smart contracts and decentralized applications. Buying $100 worth of ETH is a simple way to start investing in crypto. Choose a trusted exchange like Coinbase, Kraken, or Binance. Create an account, verify your identity, and fund it with $100 using a debit card or bank transfer. Then, purchase ETH and store it in a secure wallet. You’ll own a fraction of an ETH, which can grow in value over time. This small investment is great for learning how crypto works. Always do your research and never invest more than you can afford.