You can make money online in Nigeria in many ways. Here are some ways

As a blogger you can make money even while you sleep

Blogging

Affiliate marketing

Affiliate marketing is a cool way to make money online referring people to products

You can put your skills to use, by helping people and companies get things done online

You can start creating and uploading videos on YouTube. You make money when people watch them

You can invest and trade bitcoin or any lucrative cryptocurrency

You can complete surveys online and get paid. You help business improve their products or services

You can start your own online shop, selling online  from the comfort of your room.

Get paid monthly for referring people to Nigerian banks.

Checkout makemoney.ng for more