Depends how you like to learn. If it's through a book, others online have recommended this book if you're a programmer already [0]. Then go and learn the latest things they're adding in C++.
If you're new to programming and like books, you could try this [1].
If you learn better through videos, maybe try out TheNewBoston's stuff on Youtube [2].
Some extra links that might be helpful [3][4].
[0]: https://tinyurl.com/ydy3kq48
[1]: http://www.stroustrup.com/4th.html
[2]: https://tinyurl.com/p53p4kw
[3]: https://stackoverflow.com/questions/388242/the-definitive-c-...