That's a very good question which is difficult to answer.
Cppreference.com is not bad. I'd say take some tutorial and stick to it. That's not how I learnt so I cannot really recommend any but here is one.
Once you learnt the syntax and the basics, read some more advanced books, like Effective Modern C++ and follow some blogs, like Fluentcpp to learn about deeper topics.
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That's a very good question which is difficult to answer.
Cppreference.com is not bad. I'd say take some tutorial and stick to it. That's not how I learnt so I cannot really recommend any but here is one.
Once you learnt the syntax and the basics, read some more advanced books, like Effective Modern C++ and follow some blogs, like Fluentcpp to learn about deeper topics.