Which app is best to use for buying shares?

I have been searching too many stock market apps on playstore and even read some reviews of those sites and apps.
They have too many negative reviews like a few accounts getting banned out of nowhere, some people can't withdraw their money, etc.
So I want to know the app used by big firms and is their any original site which won't be a fake one. I can calm myself down if I lose money due to my skills but because of a scam is a no go.
I am just a noob with no prior knowledge on which app Or website I should to start investing.
What are the essential documents required for it.