Bitcoin, Bitcoin and stay with Bitcoin, because it's the safest for you as a beginner. If you can't do the research yourself, holding bitcoins is best. But if you've watched someone over the years make a good living with crypto, why don't you follow him and wake up now. You may be too afraid of risk to have more desire to get into crypto. Don't use minimal knowledge, you have to learn the basics of crypto and it needs to be done. Don't ask which crypto is good for investment, but ask yourself if you are ready with crypto and all the risks.