You're having lunch with a junior salesperson who's just starting her first sales job at your company. You're giving her advice on how to be successful as a salesperson. You say:
You've got to practice your pitch over and over until it's really tight.
"You've got to" is similar to "you need to". They're basically the same in meaning. However, "you've got to" is more common when talking about general qualities that you need in order to achieve a certain goal. For example:
"You need to" is more common when you're actually telling the listener what they should do, right now.
You need to go talk to Mrs. Green about that.
You need to stop spending so much on entertainment and put some of that money toward your savings.
"You need to" also sound more angry.
In sales, your "pitch" is what you say to people to introduce your product or to get them to buy something. It's about 30 seconds to 5 minutes long. A salesperson's pitch is usually the same, or very similar, every time they talk to a customer. You can use the word "pitch" as a noun, like in the example at top. You can also use it as a verb:
Could I come to the next Directors' meeting and pitch my idea?
There are other kinds of "pitches" as well. For example, a writer might have to "pitch" an idea for an article to an editor. At a television studio, a TV show creator "pitches" the idea for the show to the television executives.
"Over and over" is similar to "again and again". They both mean "many times". You repeat "over" two times because to "do (something) over" means to do it again one time. To do it "over and over" means to do it many times.
"Again and again" and "over and over" are similar in meaning. But "over and over" sounds like something that's more work and harder to do than "again and again":
What wears you down is when the same mistakes get made over and over again.
A good speaker understands the power of a simple message that is repeated again and again.
When a presentation or performance is "tight", it means that it's been practiced a lot and seems really professional. There aren't mistakes, or times when the speaker doesn't know what to say.
The word "tight" in this situation has a positive connotation. Another word with a similar meaning to "tight" but with a more negative feeling is "slick":
Her pitch was certainly slick, but it didn't really make me want to run out and buy one.
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