I look for income streams that do not require significant amounts of work to maintain. If I need to drastically increase the amount of product I sell or customers I attract to make good money, and that requires more of my own time to achieve, or cannot be easily outsourced to others (it often increases your labor just to organize outsourcers, so don’t assume outsourcing is a magic solution), that’s not the method for me.
Trading stocks or foreign currency exchange (forex) online isn't something that's for beginners. However, this is a lucrative field as long as you know what you're doing. There are loads of sites that will teach you how to become a proficient trader. My advice? Find a pro or a reputable system or course that you can learn from and tread wisely so that you don't lose your shirt.
Ready to enter the ecommerce fray? Why not sell your own stuff. Of course, along with selling your own stuff on your own website comes a whole slew of both responsibilities and technical configuration and requirements. For starters, you'll need a website and a hosting account. You'll also need a merchant account (sure you can use Stripe or PayPal). Then you'll need to design that site, build a sales funnel, create a lead magnet and do some email marketing.
If you have previous experience as a computer programmer or have skills in this field, then there is plenty of work you can pick up as a freelancer. If lack of confidence is holding you back, then Free Code Camp is an excellent way to get your foot in the coding door. This organization provides free courses where you will build real-life apps and programs, giving you experience and plenty to add to your CV.
One of the cool things about Google AdSense is that it's so easy to get set up. If you have a blog or website, you can sign up for a free Google AdSense Account. From there, Google will give you a unique code that you will paste onto your website. Google takes it from there, tracking your page views, traffic, and earnings on your behalf. There is no upkeep or maintenance to get this thing going, which makes it a no-brainer if you have a website already.