Where to start learning libgdx and Java in general?

Question

Java

I have a fairly basic knowledge of C# and Python, at the level of classes, methods, reading from files, etc. As far as I know, Java is very similar to Sharp in its syntax.
The question is: having such knowledge, where is the best place to start learning Java and, in particular, libgdx? Books, tutorials, videos. It would be nice if they were more detailed.

Answer 1

Like this ? :-)
PS A minute of googling. ;-)