I didn't even trust my parents with my money, how can you trust a stranger.
How about one who actually have zero or no knowledge about the crypto but have an interest on investing so as to enable Him grow more weather?
Oh look, another one who think a professional can multiply his money.
If your friend is a professional trader and can make money from it, he will not have to use other people money since he can grow his own money! trading doesn't require huge amount of money, he can start from small, so if your friend give an excuse he can't trade with small amount money, he's not a trader in the first place.