How can I download from the Apple app without having to put password in all the time? I had it on my other I phone to where I could use Face ID or click the side button to get stuff

Did you check the settings for FaceID on your device?

...

To use Face ID to purchase content from the iTunes Store, App Store, and Book Store, go to Settings > Face ID & Passcode and make sure that iTunes & App Store is turned on. Then follow these steps:

1. Open the iTunes Store, App Store, or Book Store, then tap something that you want to buy.
2. When asked to pay, double-click the side button, then glance at your iPhone or iPad. If you're wearing a face mask that covers your mouth and nose but Face ID with a mask isn't set up, tap Pay with Passcode and enter your passcode instead.
3. Wait for Done and a checkmark to display.

You might be asked to enter your Apple ID password for the first purchase you make in the iTunes Store, App Store, or Book Store.

...

copied from: Use Face ID on your iPhone or iPad Pro - Apple Support