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Regarding resources for Bare Metal, here its important for one to familiarize themselves with scheduling techniques. I've found the book "An Embedded Software Primer" by David E. Simon quite useful and easy to read. Here the data structure background from the first point becomes also essential. If you prefer separate resources on learning data structures there's the Data Structures by UC San Diego Course on Coursera, or the full Data Structures and Algorithms Specialization, there is also the Data Structures and Algorithms Using C++ on edX which focuses particularly on C++. Finally, The Algorithms is a great resource beyond these courses that provide open source code in several languages for popular data structures and algorithms.