Install Debian on a 64GB USB

I want to install Debian on a 64GB USB, but I got confused on how to do it. How can I verify the .iso download with gpg.keyring? Does the DD command look like it can easily install the OS on flash? I used the DD command. Should I have Debian installed before trying anything else?
And please, tell me which Debian should I put on flash like with persistence of full-fat Debian with the modifications to decrease writes to the flash. I need a newer version of Debian and I want it on flash. Any help?

Hello @Nico
Welcome to community! :bouquet:

I hope this link help for you.

Please check the link below