please help me understand more about stock split. some questions i have on stock split are :

1. would you invest on stock split ? why and why not? do you believe that you can make long term profit from stock split?

2. on tesla stock split example of give 5 for 1. how do you think this work for tesla stock? whats the economic impact on its stock fundamental?

3. stock split is said to be purely cosmetic. what does it mean? if its just purely cosmetic why would tesla decide to initiate stock split? and if its purely cosmetic?

4. what is reverse stock split? how it works? would you invest in reverse stock? and please give me an some famous examples of reverse stock split.