How we can add animation into svg paintings

Question

I am finding some problems in building a code for this.. Can anyone explain this with a example.. That can help a lot to me....

Answer 1

Or about this as simple but also less basic example?

https://code.sololearn.com/W6Oce8Vf16Qy/?ref=app

Answer 2

How about this code??

https://code.sololearn.com/WRA12FiThKzL/?ref=app