I've been in the same boat--relearning C++ after using C++98(!) for a long time. My first go-to book was _A Tour of C++_ , 2e by Stroustrup. Also _Effective Modern C++_ by Scott Meyers (of _Effective C++_ fame).
Other books I've been reading: _C++ 17 The Complete Guide_ by Josuttis _C++ 17 in Detail_ by Filipek
Lots of good blogs out there. Also the CPP Podcast. http://cppcast.com/
There are also a lot of great blogs covering new features. Also