Hopefully without adding too much confusion, using rpm-ostree to add systemwide new packages/applications is generally to be avoided, keep your main OS clean and stable (thankfully bazzite has done the heavy lifting here for you already for all the gaming stuff, codecs etc). General apps (office, media etc) are usually installed via flatpak (using kde discover or gnome software).
If / when you want to explore the deeper (CLI / obscure things without flatpaks) Linux world open a terminal and enter
distrobox-create --name fedora-mutable --image fedora:latest --home ~/fedora-mutable
distrobox enter fedora-mutable
You can now go ahead and use dnf, install whatever with no risk of breaking your main system. But wait, there's more, 'exit' out of fedora-mutable, type
distrobox-create --name arch --image archlinux:latest --home ~/arch
distrobox enter arch
You now have all the AUR (Arch User Repository) at your disposal, install practically any Linux program in existence, and use 'distrobox export' to put it in your main OS applications list. It's pretty glorious.
Remember to make homes for your distroboxes so they don't pollute your main home.