How to combine the elements of one list at the end of another one? In the left side of the red rectangle I have two lists. How do I manipulate them to obtain the result shown on the right? Thanks! 
AddItemToEnd would be one option.
As you have more than two lists List.Join node is another choice. (To create a 1d list based on the first half of your question) otherwise follow dimitars example
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Dimitar, That is what I thought, but am getting this. A bug? 
I think is a bug in the incremental release 1.0.1.1115.
Works fine in 9.2
Filing it on Git
ver 1.0.1.1180
Sorry, my example was done in 0.82. The node behavior was changed around 0.91/2. You’ll have to either use List.Map or rep guides as the others have shown above.