Yes you boot into recovery and reflash the ROM zip and gapps. I haven't messed around on this phone in months so I don't know if it's the ROM zip or if you messed up. I am using crdroid on my nexus 6 but I'm a couple updates behind. Orange fox recovery, ROM zip, and gapps and of course magisk is optional but I always flash it.
You sound new did you make a backup on the phone with Orange fox or usb otg stick or hdd? You restore backup if you did. The nexus 6 is probably the easiest phone to root and flash stuff.
To boot into recovery in bootloop you hold volume down and power key until it reboots into fastboot mode. Then you use volume keys to change the boot to recovery on the screen and power to enter recovery. Don't worry your phone is going to be fine.