I guess there are lots of opportunities around the whole internet. For example, you cna try yourself in affiliate marketing, but this type of activity implies initial capital in order to spend it on your first ad campaign. You can also try trading activity, but it also require initial capital. If we speak about free of charges activities, then you can try yourself in copywriting, web designing or something like that. There are enough free courses in the internet, where you can gain some knowledge about these spheres. Moreover, you can apply to topic on this forum and knowledgable people will tell you all the peculiarities.