How do you aboard a plane for first time flyers?

This will be my first time flying so please I don’t need any rude comments. I am flying to another state and after to another country. I am not sure how it all works or the steps to take in order to aboard the plane . When you check in online how do you get your boarding ticket ? After you go through tsa on your... show more This will be my first time flying so please I don’t need any rude comments. I am flying to another state and after to another country. I am not sure how it all works or the steps to take in order to aboard the plane . When you check in online how do you get your boarding ticket ? After you go through tsa on your first flight do you have to go again? What are the steps to take when you get to the airport ?
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