Question

what is the significance of green flag and stop button​

Answer 1

Answer:

The Green Flag is a programming feature that, when clicked, will start all scripts in that project that are hatted with the When Green Flag Clicked block. More simply, this block starts the project. ... This is because double-clicking runs the flag sprites multiple times, so it is less likely to have something not happen

Answer 2

Answer:

if you add when green flag clicked  in script it will starts that script

Explanation:

it helps in animation stories etc. and when red button clicks it stops script