How to choose the right capacitor for use with a voltage regulator?

Question

Arduino

The task is quite simple: power the microcontroller from the crown ( 9V ) (a controller board like Arduino, but without a built-in voltage regulator, accepts only 5V ).
I have a Linear voltage regulator L7805
amperka.ru/collection/misc-components/product/volt...
The description says: " To connect the voltage regulator, you will need a pair of capacitors. A value of 100 nF is suitable for both input and output filtering ."
However, the datasheet shows 330nF and 100nF

capacitors. Why does the store's opinion contradict the datasheet?
How to choose the right capacitor?

Answer 1

I would rather trust the datasheet than someone else's opinion. In your case, there is not much difference, but it is better to play it safe and put a larger container.