I have found a website which has all information and description about C++ STL Containers, Algorithms, Iterators, etc.
Standard Template Library Programmer’s Guide
If anyone finds any other sources of information about STL, feel free to add link of website in answers.
Hope you find this helpful.
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I use these three links .
topcoder
Hackerearth
cplusplus
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The topcoder STL tutorials are the best that I know of. Search ‘Power up STL topcoder’ on google.
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there is a channe9 video series on stl. you can check that
channel9
Try these for learning STL quickly.
Make your Question as “Community Wiki” so that everybody could add their required links to your Question. 
Already provided the link in my answer 
I have written an article on medium on C++ STL.
Maybe you like it.
The Complete Practical Guide to C++ STL