Tinkercad

Tinkercad is an online 3D design and 3D printing tool for the
masses. Whether you're a designer, hobbyist, teacher, or kid, you can use Tinkercad to make toys, prototypes, home decor, jewelry – the list is endless! There are over 4 million designs created with hundreds of new designs being added daily. 

I joined Tinkercad and done basic lessons. 

First was "Camera controls". This was pretty easy. I can use arrows on the left upper corner or do it easier with a mouse holding right button down. To zoom I can use either buttons on the screen or scroll wheel.

Second lesson was "Learning the moves". It also wasn't hard to complete. To move objects I just need to press left button on the mouse and move it.

Third was "Scale, Copy & Paste". Scaling takes a bit of time, but copying and pasting is the easiest. First, I dragged two cylinders. Then I scaled the second one to height of 15mm by dragging white dot on top of it down. Then i needed to copy the cylinder and scale it to height of 10mm. To copy objects I can either press Ctrl+C and Ctrl+V or press Alt while moving object.

Fourth lesson was "Creating holes". To create a hole I just to choose the hole feature from the inspector in right upper corner. Then I need to group object with a hole figure and the hole is created.

Fifth lesson was "Key ring, letters!" I dragged letters of my name to the base and changed their color. After that, I resized the base to fit the length of the text by moving black dot on right edge of the base.Then I removed remaining letters off the workplane. And the last step was to group everything and make it multicolor. Done!

The last lesson was "Die on the workplane" First, I dragged workplane on the side on the die. Then I dragged number 5 on the workplane and made it 1mm height. Later, I did the same with number 6 on top of the die. To reset the original view I needed to drag workplane to empty spot. Then I grouped all objects. Finished!