This gives me more confidence in Bitcoin and newbie who are looking for long-term holding should hold more bitcoin, in their private wallet to avoid exchange, but your knowledge to always have a good entry price.
This experience will open your friend's eyes in investing. it was a rewarding experience. I hope your friend doesn't decide to close the account and get out of the investment he started.
You have given good advice to your friend. and the market proves it all. your friend must regret not following you. he must learn well in asset selection and smart investment planning. and most importantly in long term investment, always keep your assets in your wallet. do not leave it on the exchange.