How much should I buy on Coinbase?

Dear financial experts, I'm a newcomer to the world of cryptocurrency and I'm considering making my first investment through Coinbase. However, I'm overwhelmed by the various options and unsure about the appropriate amount to invest. Could you please provide some guidance on how much I should buy on Coinbase? I've heard about the importance of diversifying my portfolio, but I'm also cautious about not overstretching my financial capabilities. What factors should I consider before making this decision? I'd appreciate any insights you could offer to help me make a well-informed choice.