Just make that friend you are talking about is close personal friend and not the type you met online because he might be trying to use you to launder money and buy crypto. If he has no knowledge then teach him and not let you do the job and he won't succeed in trading or investing in cryptocurrencies if only rely on other people.
Even if you are not a friend as long as you can trust him in meeting personally I think the transaction that might be made by them are safe.
Buying bitcoin with someone else is not risky if you meet in personally but if you are going to communicate online much better to use a third person/middleman as an act to escrow the fund between the buyer and the seller.