Connecting USB cable to iPhone

Then I mistook "normal." In that case, you will need an adapter. AFAIK, Apple doesn't sell them and you will need to do an Internet search for an outfit that does. One of those would be Cables-to-Go (C2G). Also note there are both Micro-A & Micro-B type USB ports so be sure to get the right one.

The 2020 iPhone SE comes with a Lighting port. In order to connect a USB Type-A (I'm assuming that is the case when you mentioned a "normal" USB), you would need a Lighting-to-USB-A cable.

Something like this one that Apple sells:

https://www.apple.com/shop/product/MD819AM/A/lightning-to-usb-cable-2-m?fnode=0c6f65dec1ab99f13608facc0fa50388e7f718922ed7ea2c6550ae9fb27c065aad8c918bd153cdd4ae164853498d47691b4e0a488c5486b89f5fe14bb9bef290491b1d2a21fc0701feca3655a085a82b96b43119d00cbe9e2155e0c9e8b4cd9c5b1f5ceb557b4f36590287ea2bd0f630