Opensea is an NFT exchange platform that allows users to buy and sell NFTs on the ethereum network.
a16z crypto is a venture capital fund that invests in crypto and web3 startups.
Coinbase is the most trusted cryptocurrency platform, and an ideal starting point if you're new to crypto. They started in 2012 with the idea that anyone, anywhere, should be able to easily and securely send and receive Bitcoin. Today, they offer a trusted and easy-to-use platform for accessing the broader crypto-economy. _When you deposit on a centralised exchange you receive an IOU for your tokens, which shows up as your wallet balance. When your tokens are held on a centralised exchange, you don't physically own them – the exchange does, and you may lose them._
Paradigm is an investment firm focused on supporting the crypto/Web3 companies and protocols of tomorrow. Our approach is flexible, long term, multi-stage, and global. We often get involved at the earliest stages of formation and continue supporting our portfolio companies over time.