How to earn free sol?

Could you elaborate on the strategies to earn free SOL tokens in the cryptocurrency world? I'm particularly interested in methods that don't involve purchasing SOL directly. Are there any specific platforms or initiatives that offer rewards in SOL? Are there any staking or mining options available for SOL? Are there any airdrops or bounties that can be claimed? Could you provide an overview of the most effective ways to accumulate SOL tokens without having to spend money upfront? Thank you for your insights into this topic.