Ask HN: Learning C++ for Java developers

Hi,

I'm a Java developer who's developed an interest working with a couple C++ based projects (OpenCV and QGIS in particular). I know that there are bindings for other languages for both of these projects, but I feel its time to buckle down and learn C++.

Does the community have any recommendations for learning C++ from the perspective of someone who has only worked with Java and Python in their educational/professional career? I also want to make sure I'm learning modern best practices and not outdated techniques, which is a hazard of Googling for random web tutorials.