For those searching for a very user friendly 3D software, check out Tinkercad. One of the most useful things that Tinkercad has to offer is the tutorials built into it. To access these tutorials, simply click LEARN as shown in the image above. At this point You will see a section of tutorials that looks similar to the image below:
Upon clicking on one of these tutorials, one will be taught how to use the features that Tinkercad has to offer. The nice things about these tutorials is that it gives you step by step instructions as you actually use the tools yourself to make the requested object. It isn't necessarily a perfect system. For example, you can completely botch up one of the tutorials, but Tinkercad will congratulate you with fireworks nonetheless. If you go back, you'll be able to see where you went wrong (hopefully) and be able to make the desired object properly the second time around.
So try it out, it's a very user friendly software!