Is it normal to talk to multiple people during early dating stage?

So, my ex and I broke up almost a year ago and it took me really long to get over it. I sometimes still mis her.

So, before i met her I [23M] was always very anxious and would overthink when talking to woman in the ‘courting process’. It really affected me and this time round with dating I wanted to change that. I heard people will talk to multiple people in early dating stages and only later become exclusive.

So now im talking to this one girl that slid into my DM’s from high school. We have been chatting since the start of the quarantine over the phone. The other person I matched on tinder have also been chatting since in the beginning of quarantine. And the other girl that gave me her number when I was waitering for her.

They’re all three really nice and a like each one for a different reason. But I haven’t even gone on a date with any one of them, havent even met face to face with two..

I was talking with them to build up confidence in how to talk to women. They all three seem interested to meet up after quarantine. Is it bad if I go on a date with all three of them? When does it become not cool to talk to multiple people? How do you decide? Do I tell them I’m also talking to other people?

I just don’t want to make anyone sad of feel betrayed. Thank you