Here’s just quick advice for you if you’re struggling to get a number after you had a good interaction with a girl.

Ideally you should do this the first time you meet them/speak to them, and make sure the first interaction doesn’t drag for too long even if you have plenty of time, make it appear as if you’re always busy, having some “business” to do.

At the end of your brief conversation just say you two should see again for whatever reason you might think of (don’t make it formal like you’re asking her on a date) just a friendly meet up in near future (5-7 days max). Then just say, yeah but we’ll need some form of contact for that, etc and give her your number and tell her to call you then and there.

You’ll get her number and you’ll know it’s real, and this way it comes of very casual.