What is the best place to brush up on C++?

In your IDE.

Cplusplus.com sololearn.com udemy.com w3schools.com

@erik404 that's a good place when you're comfortable with C++ and you're looking for practice.

@Crazed I believe the best way to learn programming is by practice. My teacher gave great example, you can't read a book about riding a bike and just go do it. You gotta practise it, you gonna fall down a few times, but eventually you are going to learn it. Unless you are a fucking pussy and you give up after falling down a few times.

code forces

If you don't know where to go, take a look at cppcon youtube channel and find a subject that tou like and work on it.

Enki