I have been asked quite a few times about ways to make money online and usually do not share the the tips that I know because it will make additional competitions plus restrictions when they abuse or misuse the tips. Here is what has worked for me over the years being online and offline as well.
There are companies that wants to get their products out there and if your browser or network connection is not blocking them, you will see it listed on the web pages of sites that you visit. If you have a website and it get traffic, Affiliate Marketing is a great way to start out but do not over do it on visual advertisements as the browser has to load them when the user visits. Remember that the user came to read the content, not see the ads. Ads are only helpful if they are shopping and your banner or link shows how to get it at a discount.
This do not always work but becoming a reseller of Internet services can be a way to make money online. You find the perfect domain name that is not registered or find one that an owner let expire (as they are short on funds, passed away or not paying attention) and register it. When someone needs the domain name, they will contact you for an offer.
One way to make money online and store credit is to take online surveys. I have taken online surveys and has used the funds to rent movies, buy music from artists that I like along with electronic version books to improve my knowledge and skills which has helped in getting my foot in the door at companies in search of talented people.