Hi @doraelixir, welcome to the Fedora community!
If you’ve not had a chance yet, please look at the #start-here category. It has some very useful information on using the forum and tips on Fedora usage.
All good. You see the line where it lists the iso that you verified? Behind it, it says: OK. That’s what you were looking for.
(The warning is about keys for 19 other isos you didn’t download but that are part of the CHECKSUM file.