I would like to know which are the good free ways to make money online.
A popular way is to install Google Adsense. You'll have to bring your traffic levels up to several thousand visitors a month in order to see anything significant. Qualified traffic is much better than random traffic for this, or anything else for that matter.
Google adsense is good if you have a blog in which you can add there the google adsense.I believe that you can earn good here if your website has many visitors per day and that they click on the advertisements from adsense. You need to do something to promote your site to drive more visitors. More visitors to your site more money from adsense.