some options for your friend:
1)if he has hardcore skills like programming, or any techy-related, try upwork.com and find a niche for himself, but a new comer will have a difficult time to get sales first, you need start with a very low price rate, get some orders then raise your hourly rate. 2)he can also choose Fiverr.com, one can provide many services there, typically $5 per case, small cash. 3)start a youtube channel: post videos that he is good at and can attract enough visitors. This is pretty much a long term endeavor as you need 4000 hours watch and 1K subscribers to get monetization enabled, but if he can find the right niche and get the hang of it, this thing is legit and can earn enough for living.
seems there are no very quick ways to make some money, but he could still try:
4) provide some quick local services for quick money 5) regard 3), he can post CPA offers under the subscription section below the Youtube video, you can earn money at very 1st day via doing CPA affiliate marketing, just post right videos, attract visitors, put offers.
Good luck