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"C++ Core Guidelines" - https://isocpp.github.io/CppCoreGuidelines/CppCoreGuidelines
Maybe nix (https://github.com/NixOS/nix) is a better tool for what you're looking for if you're on Linux, you can setup nix shells and work in them, what's installed inside the shell won't be accessible from outside.
If you can't use the STL because of exceptions: https://www.etlcpp.com/
You can definitely start putting C++ into your embedded projects, and get familiar with things in an environment in which you're already operating. A lot of great C++ code can be found with motivated use of, for example, the platformio tooling, such that you can see for yourself some existing C++ In Embedded scenarios.
In general, also, I have found that it is wise to learn C++ socially - i.e. participate in Open Source projects, as you learn/study/contribute/assist other C++ developers, on a semi-regular basis.
I've learned a lot about what I would call "decent C++ code" (i.e. shipping to tens of thousands, if not hundreds of thousands of customers) from such projects. I would suggest finding an open source C++ project, aligned with your interests, and study the codebase - as well as the repo history (i.e. gource) - to get a productive, relatively effortless (if the interests align) boost into the subject.
(My particular favourite project is the JUCE Audio library: https://juce.com/ .. one of many hundreds of great projects out there from which one can also glean modern C++ practices..)