What parts of C++ do I actually need to learn for Arduino?

I’m learning C++ using learncpp.com but only for Arduino stuff — not full-blown software dev.

I just wanna write solid Arduino code, use sensors, control outputs, and understand what’s going on in sketches.

What are the bare minimum C++ topics I should focus on before moving to the Arduino IDE?

Like, which sections of LearnCPP are actually worth studying for microcontrollers (variables, loops, functions, arrays, pointers, etc.)?