Is there anything I need to know before deciding to invest for the first time ever and using this app?

I'm thinking about joining the investing train for the first time ever but still on the fence and I know little about it but as you see the title above, I'm looking for answers as well as tips on how to go about it the right way, not aggressively or desperately.

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I do have a few questions here, let's say that I'm trading, buying, or selling:

1. Will this affect my bank account?
2. Is this true that the best chance to gain money with the trade-sell-buy thing is when the stocks are closed either in the morning or in the evening?
3. When is the right time to transfer those funds from Robinhood to your bank account?

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I believe that is all I have. I apologize for my ignorance if necessary and also if some of the things confuses you.

If I miss anything else, please let me know and you can any other tips are welcome. Thanks!

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EDIT: I forgot to add that I did research on this. I'm looking for people's input to further my decision.