These are few ways one can generate income without prior skill.
1) Swiss golden: This is an Online Gold trading company. Basically you pay for Gold online, Request for it to be sent to you or leave it with the company depending on your choice. You can resell when values appreciates. But if you do not have enough money to buy a gold bar you can get involved in the affiliate marketing. You pay a fraction of the money required to buy a gold bar, refer people to do the same. A commission is paid once you refer up to 6 people.
Disadvantage: If you join the affiliate programme, you need to be able to convince people which is difficult for introverted people.
Advantages: The risk is relatively low because you can withdraw your money if you are no longer interested in the deal although you will lose the service charges that will be deducted from your money.
Read in details if interested at: http://www.nijamode.com/2017/09/why-you-should-invest-in-gold-and-how-to.html

2) CardAfrik: Very New app, It is actually a Whot game. Sometimes tournaments are available. The price won is usually about 2,500-5,000 naira per tournament. A tournament usually consists of about 5-10 games. Download the app at https://play.google.com/store/apps/details?id=com.ghostair.cardAfrik,
Follow @CardAfrik on twitter to know when a tournament is available.
Disadvantage: The money you make is relatively small (2k-5k)
Advantage: You risk nothing cause you don’t have to use any money to join the tournament. Also you have fun while at it.

3) Affiliate Marketing: You get a commission for selling products for companies. Some companies pay as high as 10% for every sale. Google Jumia or konga affiliate programmes to know more.
Disadvantages: you need a platform.
Advantages: Low risk because you do not lose your money.
4) Binary Option: This is super fast but also super risky way of making money online. You can become a millionaire in days but you can also lose your money at that same speed. When you sign up you are given free virtual money to start with. It is best to start with that. After you practice with the virtual money, you can now decide if you want to deposit real money or not. Find out more and get links at: http://www.nijamode.com/2017/09/how-to-trade-binary-options.html
Disadvantages: Very risky, you could lose a lot of money with a few clicks.
Advantages: Very easy to learn. You can make millions in a couple of hours.
There are several other ways but most requires skills eg. Copy writing is really very lucrative.