Which capacitors for L7805 regulator?

Using Arduino General Electronics
11

However, I see lots of example circuits all over the internet that use different capacitors.

There are two reasons for this:-

  1. Different manufacturers have different minimum requirements.
  2. As long as you exceed the minimum it is not too critical what value you use. A lot depends on the application, the load and the nature of it and what your specification is for ripple you can tolerate.