C++ hive mind: please complete this sentence:

Every C++ programmer knows that ....

So that this becomes a self fulfilling prophesy and at the end of the thread, it's at least true for all programmers that read the thread :)
I'll start:
Every C++ programmer knows that ....

There is an ISO standard that describes the C++ language and standard libraries and a up to date working draft can be found at https://eel.is/c++draft/ 
Every C++ programmer knows that ....

different compilers have different levels of compliance with the standard, so when writing portable code, its important to check that all your compilers implement the language version that you are targeting.
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