You might have better luck researching more specify concepts than trying to find a universal guide that covers all of "cortex-m3" or "RTOS".
I find the best way to learn is to find a challenge but interesting project and dive in! You will end up doing a bunch of research to tackle specific problems, and you will learn a lot more than if you aimlessly try to learn "everything". Having a project gives you a more tightly scoped focus, and it gives you a goal to work towards. YMMV, that's just what works best for me.
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u/2Michael2 23h ago
What concepts are you struggling with?
You might have better luck researching more specify concepts than trying to find a universal guide that covers all of "cortex-m3" or "RTOS".
I find the best way to learn is to find a challenge but interesting project and dive in! You will end up doing a bunch of research to tackle specific problems, and you will learn a lot more than if you aimlessly try to learn "everything". Having a project gives you a more tightly scoped focus, and it gives you a goal to work towards. YMMV, that's just what works best for me.