C to C++

Question

familiar with C, what should be kept in mind when I start to learn C++?

Answer 1

Learn OOPS concepts

Answer 2

There are many concepts in C++ that C does not have. Apart from object oriented programming (OOP), I would also give templates a glance and for newer versions as C++11 and C++14, type deduction (auto keyword), variadic templates, perfect forwarding and rvalues / move semantics.
Btw, I already sorted my list by priority as some of the latter mentioned concepts require knowledge of a concept mentioned earlier in the list :-)