Since your learning is now strictly online there is a decent and mostly up-to-date tutorial you might want to go wade around in. Learn C++. https://www.learncpp.com/
Read the entire Chapter 0 - The Introduction if nothing else. Do the exercises as well.
I'd personally recommend making an effort to go through the entire website. It won't teach all of what C++ has to offer, but you will get exposed to a lot of the more common -- and modern -- features that will help a beginner.
Learning C++ online is not the hardship a lot of people make it out to be, IF the beginner is motivated to learn.