Is an explanation of the basics of an inductor (a coil) available?

Please explain how an inductor (a coil) functions.

What is the Q value of an inductor (a coil)?

Why is inductance specified by numbers such as 1, 1.5, 2.2, 3.3, etc.?

What is SRF (self-resonant frequency)?

Please explain the types of inductors (coils) and their differences.

Would it be safe to use an inductor in which a current exceeding the rated current flows momentarily?

Would it be a problem to use inductors in parallel?

Please provide a basic explanation of the process for choosing an inductor.

There are direction identification markings on some products. What are those markings for?

I would like to use high frequency inductors for impedance matching. Which products do you recommend?

I do not understand how the direction identification markings on the MLG/MHQ series inductors correspond to each other.

Which inductor is recommended for smoothing a power circuit?

Why are the characters such as "4R7" or "100" printed on some products?