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.
Being afraid of taking too many risks is a good thing as that saves you from getting more potential losses. People who tend to invest in altcoins or new coins should have this instinct of being a little afraid of the risks otherwise they will be exposed to exponential losses. Also, it is never recommended to follow someone else's decisions, especially in trading. Your trades should be based on your own research and even if based on instincts, they should be yours and not someone else's.