For a long time, I’ve just put on DejaVu fonts and been done with it. Generally good enough Unicode coverage for me. But I know it’s been years since DejaVu’s been updated, and I wonder what’s very common today.
[As for the terminal, I’m guessing it’s usually still the standard fixed Unicode fonts?]
My preference for a few years have been a combination if IBM Plex Sans for most stuff and Iosevka for monospace. They both look amazing! Iosevka might look a bit weird when first seeing it but I can't really use anything else these days. However, Fira Code is a really good monospace font as well.