There are many resources on the web that can help you learn C++. I've tried to give you a compiled list of some of the best resources out there to learn C++:
C++ : This is a great place to learn C++ as it covers almost all basic and intermediate topics in C++ in depth and is overall a great resource to learn C++.
A Tour of C++ (Bjarne Stroustrup): The “tour” is a quick tutorial overview of all of standard C++ (language and standard library, and using C++11) at a moderately high level for people who already know C++ or at least are experienced programmers.
Programming: Principles and Practice Using C++ (Bjarne Stroustrup): An introduction to programming using C++ by the creator of the language. A good read, that assumes no previous programming experience, but is not only for beginners.
The Hackerrank C++ tutorial (Hackerrank): This is a great interactive guide to learning C++ as it has challenges that you need to solve in order to pass each level. This is by far the most rewarding way to learn.
Effective C++ (Scott Meyers): This was written with the aim of being the best second book C++ programmers should read. It presents ~50 easy-to-remember rules of thumb along with their rationale in a very accessible (and enjoyable) style.
Hackr.io(Hackr.io): also has a great collection of links and resources to learn C++.
Udacity(udacity.com): also offers a great course on C++ especially for people already having some programming experience.