If I have this,
How can I connect the two walls in the following way?
I mean, I would like to understand how to connect the two parts with a curve.
If I have this,
How can I connect the two walls in the following way?
I mean, I would like to understand how to connect the two parts with a curve.
You can do that easily with the Bridge Edge Loops operator, just select both faces capping the ends you wish to join, and press Space Bar and search for Bridge Edge Loops.
Adjust parameters as desired, most importantly the Number of Segments and Smoothness.

B shortcut must be your custom setup as B should activate box select. There isn't normally a shortcut for bridge edgeloops.
– sambler
May 16 '17 at 03:27
123 for switching between Vertex Face and Edge selection mode and many more. Its a dependency, I'd have serious trouble going back now.
– Duarte Farrajota Ramos
May 17 '17 at 18:09