There are lots of options how to make money online nowadays. There are no easiest methods, because money loves only those ones who are ready to make some efforts on their way to earn it.
There are several main methods, for example: affiliate marketing, traffic arbitrage, trading, investing, copywriting, designing (UX), SEO-related fields and many many other ways. The matter here is to determine which sphere is closer to you personally, because only in the field which you are famiiliar with, you can count on solid money.
All of the spheres require skills and knowledge basically.