Can I buy or sell Crypto on Coinbase?

Good afternoon, I'm curious about the cryptocurrency market and specifically Coinbase's platform. Could you please elaborate on whether I can buy or sell cryptocurrencies on Coinbase? I've heard it's a popular platform but I'm not entirely sure of its functionalities. Additionally, I'd appreciate any insights you may have regarding the safety and security measures Coinbase employs to protect users' funds and transactions. Thank you for your time and assistance.