How to earn RPL?

Could you elaborate on the process of earning RPL tokens? I'm particularly interested in understanding the various methods available for acquiring them. Do they involve staking, mining, or are there other avenues such as liquidity mining or yield farming? Additionally, are there any specific requirements or qualifications needed to participate in earning RPL? And finally, how does the process differ from earning other types of cryptocurrencies? I'd appreciate a concise yet comprehensive overview of the earning mechanisms for RPL tokens.