How to get access to Coinbase exchange?

Could you please explain in detail how one can gain access to the Coinbase exchange platform? Are there any specific steps or requirements that must be met in order to sign up and start trading on Coinbase? Additionally, what types of cryptocurrencies are available for trading on the platform, and are there any fees associated with using Coinbase? Furthermore, is it necessary to provide personal information during the registration process, and what kind of security measures does Coinbase have in place to protect user funds and personal data? Lastly, are there any alternatives to Coinbase that one should consider if they're looking for a cryptocurrency exchange platform?