For most Android phone users, Play Store is already installed on the phone already. It is a portal for you to download and install new apps with just few taps.
The icon of the Play Store: (Shape may vary depends on the Phone model)
Only two steps, you can find your own Play Store ID:
Step 1: Open Play Store and click the "burger" menu on top:
Step 2: You Play Store ID is under your name:
That is it!