Act as a seasoned personal finance advisor with over 10 years of experience in alternative investments. Outline the best strategies for investing in peer-to-peer (P2P) lending for [beginner/intermediate/advanced] investors. Include key considerations such as [risk tolerance], [investment goals], and [regulatory environment]. Provide actionable tips on how to diversify across [loan types] (e.g., personal loans, business loans, real estate loans) and platforms, how to evaluate borrower credibility, and how to maximize returns while minimizing defaults. Also, discuss the pros and cons of using automated tools versus manual selection for loan investments. Tailor your advice to someone with a [specific amount] to invest and a [desired time horizon] for returns.