Guys, I Need Some Tips With Approaching Women?

Hello! I'm 18 and about to graduate from high school and community college. I'm also on the road of joining the Air Force. So, I'm young obviously and I never had a girlfriend and really want one. I've tried multiple times with other women by sliding in DM's on Instagram (obviously never worked out). I put up a poll and found some sources that women prefer being approached compared to meeting them on a dating app. I have zero experience on approaching women and never even have done it. I need tips on how to do it like what do I even say or what am I supposed to say when I get rejected.
I know some things like I should approach them if I think they are giving me signs. So, guys, any tips?
Guys, I Need Some Tips With Approaching Women?
Guys, I Need Some Tips With Approaching Women?
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