What is the minimum amount you can deposit in Bitcoin?

I'm curious about investing in Bitcoin, but I'm not sure about the entry point. Could you clarify for me, please? What is the minimum amount that I can deposit in Bitcoin? I'm just starting out and don't want to risk too much initially. Is there a standard minimum deposit across all platforms, or does it vary depending on the exchange or wallet service I choose? Also, would you recommend starting with a small amount to gain experience before investing larger sums? I'd appreciate any advice you can offer on this matter.