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He has about $10,000, and I think he wants to buy Bitcoin with it (that's a lot of money here in my country). The problem is that he doesn't know anything about Bitcoin, nor does he know anything about storing Bitcoin in a non-custodial wallet, or anything like that. So, I'm afraid that if I advise him to buy, he won't be able to store Bitcoin properly, such as by not keeping his seed in a secure place or giving the private key to some scammers, etc.
What do you think? Should I advise him to buy, and what are the basics I should teach him? Or is it better to let him learn on his own and make his own decisions?
Well, that's why you're there to guide your brother. Take the time to guide him.

You already know that buying Bitcoin during the bull market unless it's for the short term only isn't recommended knowing how much the reward he can get compared to the risk he will be facing. I mean if your brother is thinking of holding Bitcoin for the long term, we would suggest to wait until the bear market and then accumulate at that time.
Should you advice him to buy? Well, he can buy a small portion just to say that he bought his "FIRST BITCOIN", but don't go all in with that $10,000. If you have time, teach him some basics, and maybe throw in some YouTube videos as well that would guide him. I would suggest to let him watch some documentaries that are related to Bitcoin because that's where I started learning as well. I would suggest to let him learn especially if he really wants to learn, but if there are questions here and there, just be ready to answer those questions.
