My copy of The C++ Programming Language for C++98 is still useful today, as is copy of The C Programming Language for C89. The idea that these books are no longer useful is absurd. Modern compilers still support those versions and the new versions are largely extensions of the old (although C++11 changed some standard library definitions). The only way you could think this is if you have zero knowledge of these languages.
There are so many free learning resources for these languages that it is ridiculous to say that you need books to learn them. The books are great, but non-essential. If you insist on reading books, there is an ancient invention called a library that you can use for free.
At a glance, the code is compatible with all C standards ever published. You are too fixated on learning the latest. The latest is largely just a superset of the earlier standards and the new features are often obscure things you are unlikely to need or want to use.
The main exceptions that you actually would want to use would be the ability to declare variables anywhere in a block and use single line // comments from C++ in C99. Most C programmers do not even know about most of the things added in newer C standards beyond those and perhaps a handful of others.
I did more research and found https://isocpp.org/get-started which appears to be the authority for C++. It states that I will need a textbook for learning C++ and includes a link to Bjarne Stroustrup "Tour of C++" Amazon page (not buying it lol). For C the situation is more complicated because there appears to be multiple organizations making standards for it, and you have to pay "CHF 221.00" to even see the standard. It kind of reminds me of the web where there is also multiple consortiums making standards and browsers hopefully implement them (except the web standards are free). In conclusion I much prefer Rust where you can just read the docs without bullshit.