How do I start trading altcoins?

Hello there, I'm curious about getting into altcoin trading. Can you guide me through the process of how to begin? What are the first steps I should take? Do I need to have a specific amount of cryptocurrency already in my possession to start? What platforms or exchanges are recommended for beginners? And lastly, what are some tips or strategies you can share to help me succeed in altcoin trading? Thank you in advance for your insights.