Hey let’s all say lines to perform in public places
Lines to perform in public places? I'm guessing your awkward phrasing might be because English isn't your first language, but I want to point out the deeper significance of the words you chose here.
It's easy for men to mistakenly think of pickup/seduction/flirting/etc. as a performance guided by specific lines like a script (i.e. a late-2000s Mystery Method "routine stack" lol) as if they have to fake some sort of role like an actor in a movie. The best way to get girls, however, is to get to a point where you're expressing yourself authentically and unapologetically. Memorizing lines is a crutch used by insecure men who are too scared of someone potentially giving them negative feedback on their true selves.
The absolute best "line" to say is whatever comes to your mind in that very moment. When you see that "hot ass babe" in the library or subway, force yourself to just walk over to her to start a conversation. In those short seconds of you walking up to her, what are you imagining to say to her? Just say that.
Even if the words that come out of your mouth end up being awkward as hell, that's still better than any canned pickup lines you practiced in the mirror. Even if you embarrass yourself and she rejects you, that is still a chance for you to desensitize yourself to that negative feedback that all those losers are scared of. Do this again and again and you will eventually start getting smoother, bolder, and more confident. You will get more and more authentic and unapologetic in your approaches. You will start recognizing patterns of what works and what doesn't work.
If you can't think of anything on the spot, the universal opener is "hi" or "hello." After that, go back to the same strategy of saying whatever comes to your mind in that moment. At this point it is more important for you to get used to putting yourself out there and interacting with women as much as you can before you try to tailor a specific style or method of seduction.